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 UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549 
FORM 10-Q
ý
 
QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
 For the quarterly period ended June 30, 2018
OR
o
 
TRANSITION REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
 For the transition period from ____________ to ____________
 
Commission File Number
000-50056
MARTIN MIDSTREAM PARTNERS L.P.
(Exact name of registrant as specified in its charter)
Delaware
 
05-0527861
(State or other jurisdiction of incorporation or organization)
 
(IRS Employer Identification No.)
4200 Stone Road
Kilgore, Texas 75662
(Address of principal executive offices, zip code)

Registrant’s telephone number, including area code: (903) 983-6200

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. 
Yes  x
 
No o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). 
Yes x
 
No o
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definition of "large accelerated filer," "accelerated filer", "smaller reporting company", and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer  o
Accelerated filer  x
Non-accelerated filer   o (Do not check if a smaller reporting company)
Smaller reporting company  o
Emerging growth company  o
 
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  o

Indicated by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). 
Yes o
 
No x
 The number of the registrant’s Common Units outstanding at July 25, 2018, was 39,052,237.
 



 
Page
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

1



PART I – FINANCIAL INFORMATION
Item 1.
Financial Statements
MARTIN MIDSTREAM PARTNERS L.P.
CONSOLIDATED AND CONDENSED BALANCE SHEETS
(Dollars in thousands)
 
June 30, 2018
 
December 31, 2017
 
(Unaudited)
 
(Audited)
Assets
 
 
 
Cash
$
610

 
$
27

Accounts and other receivables, less allowance for doubtful accounts of $405 and $314, respectively
60,884

 
107,242

Product exchange receivables
174

 
29

Inventories (Note 6)
113,100

 
97,252

Due from affiliates
21,031

 
23,668

Other current assets
5,368

 
4,866

Assets held for sale (Note 4)
8,158

 
9,579

Total current assets
209,325

 
242,663

 
 
 
 
Property, plant and equipment, at cost
1,273,392

 
1,253,065

Accumulated depreciation
(450,564
)
 
(421,137
)
Property, plant and equipment, net
822,828

 
831,928

 
 
 
 
Goodwill
17,296

 
17,296

Investment in WTLPG (Note 7)
141,114

 
128,810

Other assets, net (Note 9)
28,202

 
32,801

Total assets
$
1,218,765

 
$
1,253,498

 
 
 
 
Liabilities and Partners’ Capital
 

 
 

Trade and other accounts payable
$
72,945

 
$
92,567

Product exchange payables
13,015

 
11,751

Due to affiliates
1,271

 
3,168

Income taxes payable
400

 
510

Fair value of derivatives (Note 10)
572

 
72

Other accrued liabilities (Note 9)
23,093

 
26,340

Total current liabilities
111,296

 
134,408

 
 
 
 
Long-term debt, net (Note 8)
831,928

 
812,632

Other long-term obligations
10,842

 
8,217

Total liabilities
954,066

 
955,257

 
 
 
 
Commitments and contingencies (Note 15)


 


Partners’ capital (Note 11)
264,699

 
298,241

Total partners’ capital
264,699

 
298,241

Total liabilities and partners' capital
$
1,218,765

 
$
1,253,498


See accompanying notes to consolidated and condensed financial statements.

2

MARTIN MIDSTREAM PARTNERS L.P.
CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS
(Unaudited)
(Dollars and units in thousands, except per unit amounts)


 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Revenues:
 
 
 
 
 
 
 
Terminalling and storage  *
$
24,090

 
$
24,695

 
$
48,154

 
$
49,353

Marine transportation  *
12,739

 
12,433

 
24,193

 
25,254

Natural gas services*
13,804

 
14,838

 
29,160

 
29,503

Sulfur services
2,787

 
2,850

 
5,574

 
5,700

Product sales: *
 
 
 
 
 
 
 
Natural gas services
90,643

 
73,666

 
249,806

 
200,323

Sulfur services
35,684

 
32,027

 
70,584

 
71,554

Terminalling and storage
36,824

 
33,413

 
73,304

 
65,560

 
163,151

 
139,106

 
393,694

 
337,437

Total revenues
216,571

 
193,922

 
500,775

 
447,247

 
 
 
 
 
 
 
 
Costs and expenses:
 

 
 

 
 

 
 

Cost of products sold: (excluding depreciation and amortization)
 

 
 

 
 

 
 

Natural gas services *
87,642

 
70,198

 
230,599

 
178,377

Sulfur services *
28,739

 
21,207

 
52,635

 
45,690

Terminalling and storage *
33,206

 
29,897

 
66,166

 
58,026

 
149,587

 
121,302

 
349,400

 
282,093

Expenses:
 

 
 

 
 

 
 

Operating expenses  *
31,510

 
32,552

 
62,964

 
65,926

Selling, general and administrative  *
8,572

 
8,909

 
18,240

 
18,830

Depreciation and amortization
20,891

 
20,326

 
40,101

 
45,662

Total costs and expenses
210,560

 
183,089

 
470,705

 
412,511

 
 
 
 
 
 
 
 
Other operating income (loss)
(490
)
 
15

 
(492
)
 
(140
)
Operating income
5,521

 
10,848

 
29,578

 
34,596

 
 
 
 
 
 
 
 
Other income (expense):
 

 
 

 
 

 
 

Equity in earnings of WTLPG
1,131

 
853

 
2,726

 
1,758

Interest expense, net
(13,766
)
 
(11,219
)
 
(26,451
)
 
(22,139
)
Other, net

 
520

 

 
550

Total other expense
(12,635
)
 
(9,846
)
 
(23,725
)
 
(19,831
)
 
 
 
 
 
 
 
 
Net income (loss) before taxes
(7,114
)
 
1,002

 
5,853

 
14,765

Income tax expense
(132
)
 
(13
)
 
(281
)
 
(193
)
Net income (loss)
(7,246
)
 
989

 
5,572

 
14,572

Less general partner's interest in net (income) loss
145

 
(19
)
 
(111
)
 
(291
)
Less (income) loss allocable to unvested restricted units
6

 
(3
)
 
(2
)
 
(38
)
Limited partners' interest in net income (loss)
$
(7,095
)
 
$
967

 
$
5,459

 
$
14,243

 
 
 
 
 
 
 
 
Net income (loss) per unit attributable to limited partners - basic
$
(0.18
)
 
$
0.03

 
$
0.14

 
$
0.38

Net income (loss) per unit attributable to limited partners - diluted
$
(0.18
)
 
$
0.03

 
$
0.14

 
$
0.38

Weighted average limited partner units - basic
38,722

 
38,357

 
38,829

 
37,842

Weighted average limited partner units - diluted
38,722

 
38,414

 
38,834

 
37,895

 
See accompanying notes to consolidated and condensed financial statements.
*Related Party Transactions Shown Below

3

MARTIN MIDSTREAM PARTNERS L.P.
CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS
(Unaudited)
(Dollars and units in thousands, except per unit amounts)



*Related Party Transactions Included Above
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Revenues:*
 
 
 
 
 
 
 
Terminalling and storage
$
20,507

 
$
20,331

 
$
40,532

 
$
40,035

Marine transportation
4,105

 
4,187

 
7,718

 
8,512

Natural gas services

 
6

 

 
118

Product Sales
426

 
724

 
1,068

 
2,154

Costs and expenses:*
 
 
 
 
 
 
 
Cost of products sold: (excluding depreciation and amortization)
 
 
 
 
 
 
 
Natural gas services
3,099

 
2,909

 
7,417

 
11,803

Sulfur services
4,345

 
3,767

 
8,871

 
7,442

Terminalling and storage
8,009

 
4,119

 
14,567

 
9,186

Expenses:
 
 
 
 
 
 
 
Operating expenses
14,339

 
16,452

 
27,723

 
32,828

Selling, general and administrative
6,498

 
6,500

 
14,219

 
14,068



See accompanying notes to consolidated and condensed financial statements.


4

MARTIN MIDSTREAM PARTNERS L.P.
CONSOLIDATED AND CONDENSED STATEMENTS OF CAPITAL
(Unaudited)
(Dollars in thousands)



 
Partners’ Capital
 
 
 
Common Limited
 
General Partner Amount
 
 
 
Units
 
Amount
 
 
Total
Balances - January 1, 2017
35,452,062

 
$
304,594

 
$
7,412

 
$
312,006

Net income

 
14,281

 
291

 
14,572

Issuance of common units, net
2,990,000

 
51,071

 

 
51,071

Issuance of restricted units
12,000

 

 

 

Forfeiture of restricted units
(1,750
)
 

 

 

General partner contribution

 

 
1,098

 
1,098

Cash distributions

 
(36,952
)
 
(754
)
 
(37,706
)
Unit-based compensation

 
405

 

 
405

Purchase of treasury units
(200
)
 
(4
)
 

 
(4
)
Excess purchase price over carrying value of acquired assets

 
(7,887
)
 

 
(7,887
)
Reimbursement of excess purchase price over carrying value of acquired assets

 
1,125

 

 
1,125

Balances - June 30, 2017
38,452,112

 
$
326,633

 
$
8,047

 
$
334,680

 
 
 
 
 
 
 
 
Balances - January 1, 2018
38,444,612

 
$
290,927

 
$
7,314

 
$
298,241

Net income

 
5,461

 
111

 
5,572

Issuance of common units, net of issuance related costs

 
(118
)
 

 
(118
)
Issuance of restricted units
633,425

 

 

 

Forfeiture of restricted units
(7,000
)
 

 

 

Cash distributions

 
(38,433
)
 
(784
)
 
(39,217
)
Unit-based compensation

 
520

 

 
520

Excess purchase price over carrying value of acquired assets

 
(26
)
 

 
(26
)
Purchase of treasury units
(18,800
)
 
(273
)
 

 
(273
)
Balances - June 30, 2018
39,052,237

 
$
258,058

 
$
6,641

 
$
264,699

 
See accompanying notes to consolidated and condensed financial statements.

5

MARTIN MIDSTREAM PARTNERS L.P.
CONSOLIDATED AND CONDENSED STATEMENTS OF CASH FLOWS
(Unaudited)
(Dollars in thousands)


 
Six Months Ended
 
June 30,
 
2018
 
2017
Cash flows from operating activities:
 
 
 
Net income
$
5,572

 
$
14,572

Adjustments to reconcile net income to net cash provided by operating activities:
 

 
 

Depreciation and amortization
40,101

 
45,662

Amortization of deferred debt issuance costs
1,689

 
1,445

Amortization of premium on notes payable
(153
)
 
(153
)
Loss on sale of property, plant and equipment
492

 
140

Equity in earnings of WTLPG
(2,726
)
 
(1,758
)
Derivative (income) loss
(2,069
)
 
2,392

Net cash received (paid) for commodity derivatives
2,569

 
(6,429
)
Unit-based compensation
520

 
405

Cash distributions from WTLPG
3,000

 
2,500

Change in current assets and liabilities, excluding effects of acquisitions and dispositions:
 

 
 

Accounts and other receivables
46,592

 
29,522

Product exchange receivables
(145
)
 
(13
)
Inventories
(15,900
)
 
(19,065
)
Due from affiliates
2,632

 
(9,726
)
Other current assets
(699
)
 
(1,372
)
Trade and other accounts payable
(17,333
)
 
(4,067
)
Product exchange payables
1,264

 
246

Due to affiliates
(1,897
)
 
(5,774
)
Income taxes payable
(110
)
 
(468
)
Other accrued liabilities
(5,480
)
 
(2,761
)
Change in other non-current assets and liabilities
584

 
490

Net cash provided by operating activities
58,503

 
45,788

 
 
 
 
Cash flows from investing activities:
 

 
 

Payments for property, plant and equipment
(23,566
)
 
(19,756
)
Acquisitions

 
(19,533
)
Payments for plant turnaround costs

 
(1,591
)
Proceeds from sale of property, plant and equipment
98

 
1,597

Proceeds from repayment of Note receivable - affiliate

 
15,000

Contributions to WTLPG
(12,578
)
 
(145
)
Net cash used in investing activities
(36,046
)
 
(24,428
)
 
 
 
 
Cash flows from financing activities:
 

 
 

Payments of long-term debt
(199,000
)
 
(184,000
)
Proceeds from long-term debt
218,000

 
155,000

Proceeds from issuance of common units, net of issuance related costs
(118
)
 
51,071

General partner contribution

 
1,098

Purchase of treasury units
(273
)
 
(4
)
Payment of debt issuance costs
(1,240
)
 
(40
)
Excess purchase price over carrying value of acquired assets
(26
)
 
(7,887
)
Reimbursement of excess purchase price over carrying value of acquired assets

 
1,125

Cash distributions paid
(39,217
)
 
(37,706
)
Net cash used in financing activities
(21,874
)
 
(21,343
)
 
 
 
 
Net increase in cash
583

 
17

Cash at beginning of period
27

 
15

Cash at end of period
$
610

 
$
32

Non-cash additions to property, plant and equipment
$
1,811

 
$
3,666


See accompanying notes to consolidated and condensed financial statements.

6

MARTIN MIDSTREAM PARTNERS L.P.
NOTES TO CONSOLIDATED AND CONDENSED FINANCIAL STATEMENTS
(Dollars in thousands, except where otherwise indicated)
June 30, 2018
(Unaudited)




NOTE 1. NATURE OF OPERATIONS AND BASIS OF PRESENTATION

Martin Midstream Partners L.P. (the "Partnership") is a publicly traded limited partnership with a diverse set of operations focused primarily in the United States ("U.S.") Gulf Coast region. Its four primary business lines include:  natural gas services, including liquids transportation and distribution services and natural gas storage; terminalling and storage services for petroleum products and by-products including the refining of naphthenic crude oil, blending and packaging of finished lubricants; sulfur and sulfur-based products processing, manufacturing, marketing and distribution; and marine transportation services for petroleum products and by-products.
 
The Partnership’s unaudited consolidated and condensed financial statements have been prepared in accordance with the requirements of Form 10-Q and U.S. Generally Accepted Accounting Principles ("U.S. GAAP") for interim financial reporting. Accordingly, these financial statements have been condensed and do not include all of the information and footnotes required by U.S. GAAP for annual audited financial statements of the type contained in the Partnership’s annual reports on Form 10-K. In the opinion of the management of the Partnership’s general partner, all adjustments and elimination of significant intercompany balances necessary for a fair presentation of the Partnership’s financial position, results of operations, and cash flows for the periods shown have been made. All such adjustments are of a normal recurring nature. Results for such interim periods are not necessarily indicative of the results of operations for the full year. These financial statements should be read in conjunction with the Partnership’s audited consolidated financial statements and notes thereto included in the Partnership’s annual report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission (the "SEC") on February 16, 2018, as amended by Amendment No. 1 on Form 10-K/A for the year ended December 31, 2017 filed on March 29, 2018.

Management has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities to prepare these consolidated and condensed financial statements in conformity with U.S. GAAP.  Actual results could differ from those estimates.

Correction of Immaterial Error. The second quarter and year to date amounts for 2017 have been revised to reflect a reclassification in the presentation of certain expenses associated with the manufacturing and shipping of product related to a location in the Partnership's Terminalling and Storage operating segment.  The reclassification resulted in a decrease in operating expenses from $34,435 to $32,552 and an increase in cost of products sold from $119,419 to $121,302 for the three months ended June 30, 2017, and a decrease in operating expenses from $69,492 to $65,926 and an increase in cost of products sold from $278,527 to $282,093 for the six months ended June 30, 2017.

NOTE 2. NEW ACCOUNTING PRONOUNCEMENTS

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU replaced most existing revenue recognition guidance in U.S. GAAP. The new standard is effective for the Partnership on January 1, 2018. The standard permits the use of either the retrospective or cumulative effect transition method. The Partnership adopted the new standard utilizing the cumulative effect method which will result in the cumulative effect of the adoption being recorded as of January 1, 2018. The Partnership adopted ASU 2014-09 on January 1, 2018 and did not identify any significant changes in the timing of revenue recognition when considering the amended accounting guidance. Additional disclosures related to revenue recognition appear in "Note 5. Revenue."
    
In February 2016, the FASB issued ASU 2016-02, Leases.  This ASU amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption of this standard is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief.  The Partnership is evaluating the effect that ASU 2016-02 will have on its consolidated and condensed financial statements and related disclosures.


7

MARTIN MIDSTREAM PARTNERS L.P.
NOTES TO CONSOLIDATED AND CONDENSED FINANCIAL STATEMENTS
(Dollars in thousands, except where otherwise indicated)
June 30, 2018
(Unaudited)



NOTE 3. ACQUISITIONS

Acquisition of Terminalling Assets.    On February 22, 2017, the Partnership acquired 100% of the membership interests of MEH South Texas Terminals LLC ("MEH"), a subsidiary of Martin Resource Management, for a purchase price of $27,420 (the "Hondo Acquisition"), which was funded with borrowings under the Partnership's revolving credit facility. At the date of acquisition, MEH was in the process of constructing an asphalt terminal facility in Hondo, Texas (the "Hondo Terminal"), to serve the asphalt market in San Antonio, Texas and surrounding areas. This acquisition is considered a transfer of net assets between entities under common control. The acquisition of these assets was recorded at the historical carrying value of the assets at the acquisition date. The excess of the purchase price over the carrying value of the assets of $7,887 was recorded as an adjustment to "Partners' capital" during the six months ended June 30, 2017. During 2018, the Partnership paid an additional $26 related to a purchase price true-up, which was recorded as a further adjustment to "Partners' capital" for the six months ended June 30, 2018.
Original purchase price
$
27,420

Purchase price true-up
26

Historical carrying value of assets allocated to "Property, plant and equipment"
19,533

Excess purchase price over carrying value of acquired assets
$
7,913



As no individual line item of the historical financial statements of the acquired assets was in excess of 3% of the Partnership's relative consolidated financial statement captions, the Partnership elected not to retrospectively recast the historical financial information to include these assets.

NOTE 4. DIVESTITURES, ASSET IMPAIRMENTS, AND DISCONTINUED OPERATIONS

Long-Lived Assets Held for Sale

At June 30, 2018 and December 31, 2017, certain terminalling and storage and marine transportation assets met the criteria to be classified as held for sale in accordance with ASC 360-10 and are presented at the lower of the assets' carrying amount or fair value less cost to sell by segment in current assets as follows:
 
June 30, 2018
 
December 31, 2017
 
 
 
 
Terminalling and storage
$
4,358

 
$
4,152

Marine transportation
3,800

 
5,427

    Assets held for sale
$
8,158

 
$
9,579



These assets are considered non-core assets to the Partnership's operations and did not qualify for discontinued operations presentation under the guidance of ASC 205-20.


8

MARTIN MIDSTREAM PARTNERS L.P.
NOTES TO CONSOLIDATED AND CONDENSED FINANCIAL STATEMENTS
(Dollars in thousands, except where otherwise indicated)
June 30, 2018
(Unaudited)



NOTE 5. REVENUE

The following table disaggregates our revenue by major source:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Terminalling and storage segment
 
 
 
 
 
 
 
Lubricant product sales
$
36,824

 
$
33,413

 
$
73,304

 
$
65,560

Throughput and storage
24,090

 
24,695

 
48,154

 
49,353

 
$
60,914

 
$
58,108

 
$
121,458

 
$
114,913

Natural gas services segment
 
 
 
 
 
 
 
Natural gas liquids product sales
$
90,643

 
$
73,666

 
$
249,806

 
$
200,323

Natural gas storage
13,804

 
14,838

 
29,160

 
29,503

 
$
104,447

 
$
88,504

 
$
278,966

 
$
229,826

Sulfur service segment
 
 
 
 
 
 
 
Sulfur product sales
$
10,479

 
$
11,193

 
$
22,316

 
$
24,273

Fertilizer product sales
25,205

 
20,834

 
48,268

 
47,281

Sulfur services
2,787

 
2,850

 
5,574

 
5,700

 
$
38,471

 
$
34,877

 
$
76,158

 
$
77,254

Marine transportation segment
 
 
 
 
 
 
 
Inland transportation
$
11,206

 
$
11,022

 
$
20,898

 
$
22,313

Offshore transportation
1,533

 
1,411

 
3,295

 
2,941

 
$
12,739

 
$
12,433

 
$
24,193

 
$
25,254



Revenue is measured based on a consideration specified in a contract with a customer and excludes amounts collected on behalf of third parties where the Partnership is acting as an agent. The Partnership recognizes revenue when the Partnership satisfies a performance obligation, which typically occurs when the Partnership transfers control over a product to a customer or as the Partnership delivers a service.

The following is a description of the principal activities - separated by reportable segments - from which the Partnership generates revenue.

Terminalling and Storage Segment

Revenue is recognized for storage contracts based on the contracted monthly tank fixed fee.  For throughput contracts, revenue is recognized based on the volume moved through the Partnership’s terminals at the contracted rate.  For the Partnership’s tolling agreement, revenue is recognized based on the contracted monthly reservation fee and throughput volumes moved through the facility.  When lubricants and drilling fluids are sold by truck or rail, revenue is recognized when title is transfered, which is either upon delivering product to the customer or when the product leaves the Partnership's facility, depending on the specific terms of the contract. Delivery of product is invoiced as the transaction occurs and is generally paid within a month.

Natural Gas Services Segment

Natural Gas Liquids ("NGL") distribution revenue is recognized when product is delivered by truck, rail, or pipeline to the Partnership's NGL customers. Revenue is recognized on title transfer of the product to the customer. Delivery of product is invoiced as the transaction occurs and are generally paid within a month. Natural gas storage revenue is recognized when the service is provided to the customer. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

9

MARTIN MIDSTREAM PARTNERS L.P.
NOTES TO CONSOLIDATED AND CONDENSED FINANCIAL STATEMENTS
(Dollars in thousands, except where otherwise indicated)
June 30, 2018
(Unaudited)




Sulfur Services Segment

Revenue from sulfur product sales is recognized when the customer takes title to the product.  Delivery of product is invoiced as the transaction occurs and are generally paid within a month. Revenue from sulfur services is recognized as services are performed during each monthly period. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

Marine Transportation Segment

Revenue is recognized for time charters based on a per day rate. For contracted trips, revenue is recognized upon completion of the particular trip. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

The table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied at the end of the reporting period. The Partnership applies the practical expedient in ASC 606-10-50-14(a) and does not disclose information about remaining performance obligations that have original expected durations of one year or less.
 
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
 
Total
Terminalling and storage
 
 
 
 
 
 
 
 
 
 
 
 
 
Storage and throughput
$
25,119

 
$
50,629

 
$
49,330

 
$
46,022

 
$
41,505

 
$
393,700

 
$
606,305

Natural gas services
 
 
 
 
 
 
 
 
 
 
 
 
 
Natural gas storage
$
19,141

 
$
32,703

 
$
26,935

 
$
25,134

 
$
24,615

 
$
10,107

 
$
138,635

Sulfur services
 
 
 
 
 
 
 
 
 
 
 
 
 
Sulfur product sales
$
8,398

 
$
16,796

 
$
4,898

 
$
1,181

 
$
295

 
$

 
$
31,568

Marine transportation
 
 
 
 
 
 
 
 
 
 
 
 
 
Offshore transportation
$
3,128

 
$
6,205

 
$
6,069

 
$

 
$

 
$

 
$
15,402

Total
$
55,786

 
$
106,333

 
$
87,232

 
$
72,337

 
$
66,415

 
$
403,807

 
$
791,910



NOTE 6. INVENTORIES

Components of inventories at June 30, 2018 and December 31, 2017 were as follows: 
 
June 30, 2018
 
December 31, 2017
Natural gas liquids
$
60,176

 
$
47,462

Sulfur
14,542

 
8,436

Sulfur based products
12,108