Archrock Partners (APLP) 10-Q 2 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 26, 2018
Document and Entity Information
Entity Registrant Name	Archrock Partners, L.P.
Entity Central Index Key	1,367,064
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		70,231,036
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash	$ 51	$ 8,078
Accounts receivable, trade, net of allowance of $1,502 and $1,296, respectively	69,391	67,714
Current portion of interest rate swaps	2,816	186
Accrued interest on loan receivable due from Archrock	263	0
Total current assets	72,521	75,978
Property, plant and equipment	2,811,243	2,727,401
Accumulated depreciation	(978,550)	(953,325)
Property, plant and equipment, net	1,832,693	1,774,076
Intangible assets, net	53,061	60,747
Contract costs	24,660	0
Loan receivable due from Archrock	60,500	0
Other long-term assets	24,827	19,401
Total assets	2,068,262	1,930,202
Current liabilities:
Accounts payable, trade	40,559	18,368
Accrued liabilities	9,546	7,597
Deferred revenue	7,730	1,299
Accrued interest	12,835	12,972
Due to Archrock, net	8,849	4,683
Current portion of interest rate swaps	0	134
Total current liabilities	79,519	45,053
Long-term debt	1,458,863	1,361,053
Other long-term liabilities	8,596	9,356
Total liabilities	1,546,978	1,415,462
Commitments and contingencies (Note 12)
Partners’ capital:
Common units: 70,231,036 and 70,310,590 issued, respectively	497,875	501,023
General partner units: 1,422,458 and 1,421,768 issued and outstanding, respectively	11,543	11,582
Accumulated other comprehensive income	11,866	4,476
Treasury units: 113,609 common units at December 31, 2017	0	(2,341)
Total partners’ capital	521,284	514,740
Total liabilities and partners’ capital	$ 2,068,262	$ 1,930,202

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, trade, allowance (in dollars)	$ 1,502	$ 1,296
Common units, units issued (in units)	70,231,036	70,310,590
General partner units, equivalent units issued (in units)	1,422,458	1,421,768
General partner units, equivalent units outstanding (in units)	1,422,458	1,421,768
Treasury units, common units (in units)		113,609

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 150,866	$ 138,255	$ 297,868	$ 275,550
Costs and expenses:
Cost of sales (excluding depreciation and amortization)	60,226	53,995	116,528	110,272
Selling, general and administrative	19,344	18,303	39,145	38,614
Depreciation and amortization	33,898	36,275	68,224	73,160
Long-lived asset impairment	3,846	3,081	6,912	9,291
Interest expense, net	22,542	21,299	44,151	41,522
Debt extinguishment costs	0	0	0	291
Merger-related costs	1,340	0	2,716	0
Other income, net	(394)	(933)	(681)	(821)
Total costs and expenses	140,802	132,020	276,995	272,329
Income before income taxes	10,064	6,235	20,873	3,221
Provision for (benefit from) income taxes	(417)	960	102	2,262
Net income	$ 10,481	$ 5,275	$ 20,771	$ 959

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 10,481	$ 5,275	$ 20,771	$ 959
Other comprehensive income:
Interest rate swap gain, net of reclassifications to earnings	2,178	463	7,163	2,138
Amortization of terminated interest rate swaps	61	0	227	0
Total other comprehensive income	2,239	463	7,390	2,138
Comprehensive income	$ 12,720	$ 5,738	$ 28,161	$ 3,097

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Treasury Units	Accumulated Other Comprehensive Income (Loss)	Partners' Capital Common Units	Partners' Capital General Partner Units
Beginning balance at Dec. 31, 2016	$ 522,173	$ (1,892)	$ (4,170)	$ 516,208	$ 12,027
Beginning balance (in units) at Dec. 31, 2016		(86,795)		65,606,655	1,326,965
Increase (Decrease) in Partners' Capital
Issuance of common units for vesting of phantom units (in units)				83,734
Treasury units purchased	(404)	$ (404)
Treasury units purchased (in units)		(22,977)
Issuance of general partner units	22				$ 22
Issuance of general partner units (in units)					1,231
Distribution of capital, net	(511)			$ (370)	$ (141)
Cash distributions	(38,231)			(37,474)	(757)
Unit-based compensation expense	557			557
Comprehensive income
Net income	959			940	19
Interest rate swap gain, net of reclassifications to earnings	2,138		2,138
Amortization of terminated interest rate swaps	0
Ending balance at Jun. 30, 2017	486,703	$ (2,296)	(2,032)	$ 479,861	$ 11,170
Ending balance (in units) at Jun. 30, 2017		(109,772)		65,690,389	1,328,196
Increase (Decrease) in Partners' Capital
Cumulative effect of adoption of new accounting principle | ASU 2014-09	12,714			$ 12,462	$ 252
Cumulative effect of adoption of new accounting principle | ASU 2017-12	383			375	8
Beginning balance at Dec. 31, 2017	514,740	$ (2,341)	4,476	$ 501,023	$ 11,582
Beginning balance (in units) at Dec. 31, 2017		(113,609)		70,310,590	1,421,768
Increase (Decrease) in Partners' Capital
Issuance of common units for vesting of phantom units (in units)				53,091
Treasury units purchased	(250)	$ (250)
Treasury units purchased (in units)		(19,036)
Issuance of general partner units	9				$ 9
Issuance of general partner units (in units)					690
Distribution of capital, net	1,504			$ 1,504
Cash distributions	(36,291)			(35,571)	$ (720)
Unit-based compensation expense	314			314
Merger-related adjustments		$ 2,591		$ (2,591)
Merger-related adjustments (in units)		132,645		(132,645)
Comprehensive income
Net income	20,771			$ 20,359	412
Interest rate swap gain, net of reclassifications to earnings	7,163		7,163
Amortization of terminated interest rate swaps	227		227
Ending balance at Jun. 30, 2018	$ 521,284	$ 0	$ 11,866	$ 497,875	$ 11,543
Ending balance (in units) at Jun. 30, 2018		0		70,231,036	1,422,458

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 20,771	$ 959
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	68,224	73,160
Long-lived asset impairment	6,912	9,291
Amortization of deferred financing costs	2,862	3,017
Amortization of debt discount	694	653
Amortization of terminated interest rate swaps	227	0
Debt extinguishment costs	0	291
Interest rate swaps	327	980
Unit-based compensation expense	314	557
Provision for doubtful accounts	549	941
Gain on sale of property, plant and equipment	(618)	(759)
Deferred income tax provision (benefit)	(140)	2,232
Amortization of contract costs	4,758	0
Changes in assets and liabilities:
Accounts receivable, trade	(2,477)	445
Contract costs	(13,102)	0
Other assets and liabilities	4,422	6,991
Net cash provided by operating activities	93,723	98,758
Cash flows from investing activities:
Capital expenditures	(115,510)	(71,612)
Proceeds from sale of property, plant and equipment	13,719	5,062
Proceeds from insurance	252	0
Increase in amounts due from Archrock, net	0	(2,336)
Loan receivable due from Archrock	(60,500)	0
Net cash used in investing activities	(162,039)	(68,886)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	272,830	789,000
Repayments of long-term debt	(176,636)	(756,500)
Payments for debt issuance costs	(3,332)	(14,855)
Payments for settlement of interest rate swaps that include financing elements	(207)	(1,041)
Distributions to unitholders	(36,291)	(38,231)
Net proceeds from sale of general partner units	9	22
Purchases of treasury units	(250)	(404)
Increase (decrease) in amounts due to Archrock, net	4,166	(8,012)
Net cash provided by (used in) financing activities	60,289	(30,021)
Net decrease in cash	(8,027)	(149)
Cash at beginning of period	8,078	217
Cash at end of period	51	68
Supplemental disclosure of non-cash transactions:
Non-cash capital contribution from limited and general partner	1,504	2,720
Contract operations equipment acquired/exchanged, net	$ 0	$ (3,231)

Organization

Organization	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Organization	1. Organization We are a Delaware limited partnership formed in June 2006 to provide natural gas contract operations services to customers throughout the U.S. Our contract operations services primarily include designing, sourcing, owning, installing, operating, servicing, repairing and maintaining equipment to provide natural gas compression services to our customers. The accompanying unaudited condensed consolidated financial statements included herein have been prepared in accordance with U.S. GAAP for interim financial information and the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP are not required in these interim financial statements and have been condensed or omitted. Management believes that the information furnished includes all adjustments, consisting only of normal recurring adjustments, which are necessary to present fairly our consolidated financial position, results of operations and cash flows for the periods indicated. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements presented in our 2017 Form 10-K, which contains a more comprehensive summary of our accounting policies. The interim results reported herein are not necessarily indicative of results for a full year. Certain prior year amounts have been reclassified to conform to the current year presentation. Merger Transaction On April 26, 2018, Archrock completed the acquisition of all of our outstanding common units and we became a wholly-owned subsidiary of Archrock. With the closing of the Merger, Archrock issued 57.6 million shares of its common stock at a fixed exchange ratio of 1.40 shares for each of the 41.2 million common units not owned by Archrock prior to the Merger. Additionally, all outstanding treasury units were retired and our incentive distribution rights, all of which were previously owned indirectly by Archrock prior to the Merger, were canceled and ceased to exist. As a result of the Merger, our common units are no longer publicly traded. Our Notes were not impacted by the Merger and remain outstanding. Prior to the Merger, public unitholders held an approximate 57% ownership interest in us and Archrock owned our remaining equity interests, including the general partner interest. Subsequent to the Merger, Archrock continues to hold all of our general partner interest.

Recent Accounting Developments

Recent Accounting Developments	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Developments	2. Recent Accounting Developments Accounting Standards Updates Implemented On January 1, 2018, we adopted ASU 2017-12 using the modified retrospective approach to existing cash flow hedge relationships as of January 1, 2018. ASU 2017-12 expands and refines hedge accounting for both financial and nonfinancial risk components, aligns the recognition and presentation of the effects of the hedging instrument and hedged item in the financial statements and eliminates the requirement to separately measure and report hedge ineffectiveness. As a result of the adoption of ASU 2017-12, we recognized a net gain of $0.4 million as a cumulative-effect adjustment to opening retained earnings and a corresponding adjustment to other comprehensive income (loss) to reverse the cumulative ineffectiveness previously recognized in interest expense. On January 1, 2018, we adopted ASU 2016-15 on a retrospective basis. ASU 2016-15 addresses diversity in practice and simplifies several elements of cash flow classification including how certain cash receipts and cash payments are classified in the statement of cash flows. ASU 2016-15 did not have an impact on our condensed consolidated statement of cash flow for the six months ended June 30, 2017 . Revenue Recognition Update On January 1, 2018, we adopted the Revenue Recognition Update using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. We recognized the cumulative effect of initially applying the Revenue Recognition Update as an adjustment to the opening balance of retained earnings. For contracts that were modified before the effective date, we identified performance obligations on the basis of the current version of the contract, which included any contract modifications since inception. The application of the practical expedient for contract modifications did not have a material effect on the adjustment to retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Under previous guidance, contract operations revenue was recognized when earned, which generally occurs monthly when the service is provided under our customer contracts. Under the Revenue Recognition Update the timing of revenue recognition is impacted by contractual provisions for service availability guarantees of our compressor assets and re-billable costs associated with moving our compressor assets to a customer site. These changes are further discussed below and did not result in a material difference from previous practice for contract operations. The Revenue Recognition Update provides guidance on contract costs that should be recognized as assets and amortized over the period that the related goods or services transfer to the customer. Certain costs that were previously expensed as incurred, such as sales commissions and freight charges to transport compressor assets, are deferred and amortized. The following table summarizes the cumulative impact of the adoption of the Revenue Recognition Update on the opening balance sheet (in thousands): December 31, 2017 Adjustments Due to the Revenue Recognition Update January 1, 2018 Assets Contract costs $ — $ 16,316 $ 16,316 Liabilities Accrued liabilities $ 7,597 $ 186 $ 7,783 Deferred revenue 1,299 3,416 4,715 Partners ’ capital Common units $ 501,023 $ 12,462 $ 513,485 General partner units 11,582 252 11,834 The following tables summarize the impact of the application of the Revenue Recognition Update on our condensed consolidated balance sheet and condensed consolidated statement of operations (in thousands): June 30, 2018 Balance Sheet As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Assets Accounts receivable, trade $ 69,391 $ 69,237 $ 154 Contract costs 24,660 — 24,660 Liabilities Accrued liabilities $ 9,546 $ 9,349 $ 197 Deferred revenue 7,730 1,497 6,233 Other long-term liabilities 8,596 8,608 (12 ) Equity Common units $ 497,875 $ 479,895 $ 17,980 General partner units 11,543 11,127 416 Three Months Ended June 30, 2018 Statement of Operations As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Revenue $ 150,866 $ 151,798 $ (932 ) Cost of sales (excluding depreciation and amortization) 60,226 63,740 (3,514 ) Selling, general and administrative 19,344 19,671 (327 ) Benefit from income taxes (417 ) (393 ) (24 ) Net income 10,481 7,548 2,933 Six Months Ended June 30, 2018 Statement of Operations As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Revenue $ 297,868 $ 300,543 $ (2,675 ) Cost of sales (excluding depreciation and amortization) 116,528 124,037 (7,509 ) Selling, general and administrative 39,145 39,981 (836 ) Provision for income taxes 102 114 (12 ) Net income 20,771 15,089 5,682 Accounting Standards Updates Not Yet Implemented In June 2016, the FASB issued ASU 2016-13 that changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019 and early adoption is permitted. Entities will apply ASU 2016-13 provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. We are currently evaluating the impact of ASU 2016-13 on our consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02 that establishes a ROU model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Under the new guidance, lessor accounting is largely unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach that involves recasting the comparative periods in the year of initial application is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain optional transition practical expedients available. We intend to adopt ASU 2016-02 on January 1, 2019 and are currently assessing the practical expedients. Though our assessment of the impact of the adoption of ASU 2016-02 is ongoing, we anticipate significant changes to our consolidated balance sheets and disclosures based on the requirements prescribed by the new standard. We do not believe the standard will materially affect our consolidated statements of operations. We are in the process of assessing changes to our internal control structure and will continue to evaluate our business processes, systems and accounting policies that are necessary to implement this standard.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customers	3. Revenue from Contracts with Customers Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we are entitled to receive in exchange for those goods or services. Sales and usage-based taxes that are collected from the customer are excluded from revenue. The following table presents our revenue from contracts with customers disaggregated by revenue source (in thousands): Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 0 - 1,000 horsepower per unit $ 54,389 $ 108,816 1,001 - 1,500 horsepower per unit 63,390 124,084 Over 1,500 horsepower per unit 32,465 63,900 Other (1) 622 1,068 Total revenue (2) $ 150,866 $ 297,868 —————— (1) Primarily relates to fees associated with Partnership-owned non-compressor equipment. (2) Includes $1.4 million and $2.5 million for three and six months ended June 30, 2018 , respectively, related to billable maintenance on Partnership-owned units that was recognized at a point in time. All other revenue is recognized over time. Contract Operations We provide comprehensive contract operations services, including the personnel, equipment, tools, materials and supplies to meet our customers’ natural gas compression needs. Based on the operating specifications at the customer location and each customer's unique needs, these services include designing, sourcing, owning, installing, operating, servicing, repairing and maintaining equipment to provide natural gas compression services to our customers. Natural gas compression services are generally satisfied over time, as the customer simultaneously receives and consumes the benefits provided by these services. Our performance obligation is a series in which the unit of service is one month, as the customer receives substantially the same benefit each month from the services regardless of the type of service activity performed, which may vary. If the transaction price is based on a fixed fee, revenue is recognized monthly on a straight-line basis over the period that we are providing services to the customer. Amounts invoiced to customers for costs associated with moving our compressor assets to a customer site are also included in the transaction price and are amortized over the initial contract term. Variable consideration exists if customers are billed at a lesser standby rate when a unit is not running. We have elected to apply the invoicing practical expedient to recognize revenue for such variable consideration, as the invoice corresponds directly to the value transferred to the customer based on our performance completed to date. The rate for standby service is lower to reflect the decrease in costs and effort required to provide standby service when a unit is not running. We also perform billable maintenance service on our natural gas compression equipment at the customer’s request on an as-needed basis. The performance obligation is satisfied and revenue is recognized at the agreed-upon transaction price at the point in time when service is complete and the customer has accepted the work performed and can obtain the remaining benefits of the service that the unit will provide. As of June 30, 2018 , we had $209.2 million of remaining performance obligations related to our contract compression service. We have elected the practical expedient to not consider the effects of the time value of money, as the expected time between the transfer of services and payment for such services is less than one year. This amount will be recognized through 2021 as follows (in thousands): 2018 2019 2020 2021 Total Remaining performance obligations $ 115,558 $ 66,981 $ 22,681 $ 3,993 $ 209,213 Contract Balances Contract operations services are generally billed monthly at the beginning of the month in which service is being provided. We recognize a contract asset when we have the right to consideration in exchange for goods or services transferred to a customer when the right is conditioned on something other than the passage of time. We recognize a contract liability when we have an obligation to transfer goods or services to a customer for which we have already received consideration. Freight billings to transport compressor assets often result in a contract liability. As of June 30, and January 1, 2018 , our receivables from contracts with customers, net of allowance for doubtful accounts were $68.7 million and $66.2 million , respectively. As of June 30, and January 1, 2018 , our contract liabilities were $8.1 million and $5.4 million , respectively, which are included in deferred revenue and other long-term liabilities in our condensed consolidated balance sheets. The increase in the contract liability balance was due to the deferral of $8.1 million partially offset by $5.4 million recognized as revenue during the period, each primarily related to freight billings. 5. Contract Costs We capitalize incremental costs to obtain a contract with a customer if we expect to recover those costs. Capitalized costs include commissions paid to our sales force to obtain contract operations contracts. As of June 30, and January 1, 2018, we recorded contract costs of $2.8 million and $2.0 million , respectively, associated with sales commissions. We capitalize costs incurred to fulfill a contract if those costs relate directly to a contract, enhance resources that we will use in satisfying performance obligations and if we expect to recover those costs. Capitalized costs incurred to fulfill our customer contracts include freight charges to transport compressor assets before transferring services to the customer and mobilization activities associated with our contract operations services. As of June 30, and January 1, 2018, we recorded contract costs of $21.9 million and $14.3 million , respectively, associated with freight and mobilization. Contract operations costs are amortized based on the transfer of service to which the assets relate, which is estimated to be 36 months based on average contract term, including anticipated renewals. We assess periodically whether the 36 -month estimate fairly represents the average contract term and adjust as appropriate. Contract costs associated with commissions are amortized to SG&A. Contract costs associated with freight and mobilization are amortized to cost of sales (excluding depreciation and amortization). During the three and six months ended June 30, 2018 , we amortized $0.3 million and $0.5 million , respectively, related to commissions and $2.4 million and $4.3 million , respectively, related to freight and mobilization. During the three and six months ended June 30, 2018 , there were no impairment losses recorded in relation to the costs capitalized.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	4. Related Party Transactions Revolving Loan Agreement with Archrock In conjunction with the closing of the Merger on April 26, 2018, we and Archrock entered into the Revolving Loan Agreement under which we may make loans to Archrock from time to time in an aggregate amount not to exceed the Credit Facility’s outstanding balance. The Revolving Loan Agreement matures on the maturity date of our Credit Facility. Interest on amounts loaned under the Revolving Loan Agreement is payable to us on a monthly basis and is calculated as a proportion of our total interest expense on the Credit Facility. On April 26, 2018, Archrock terminated its credit facility and repaid the $63.2 million in outstanding borrowings and accrued and unpaid interest and fees under the Archrock credit facility with a borrowing under the Revolving Loan Agreement. See Notes 1 (“Organization”) and 6 (“Long-Term Debt”) for further details of the Merger and our pay down of the Archrock credit facility. At June 30, 2018 , the balance of outstanding borrowings under the Revolving Loan Agreement was $60.5 million . During the three and six months ended June 30, 2018 , we recorded $0.6 million of interest income earned on loans to Archrock under the Revolving Loan Agreement which was included in interest expense, net in our condensed consolidated statements of operations. Omnibus Agreement Our Omnibus Agreement with Archrock provides for, among other things: • Archrock’s obligation to provide all operational staff, corporate staff and support services reasonably necessary to operate our business and our obligation to reimburse Archrock for such services; • the terms under which we, Archrock, and our respective affiliates may transfer, exchange or lease compression equipment among one another; • Archrock’s grant to us of a license to use certain intellectual property, including the “Archrock” logo; and • Archrock’s and our obligations to indemnify each other for certain liabilities. Common Control Transactions Transactions between us and Archrock and its affiliates are transactions between entities under common control. Under GAAP, transfers of assets and liabilities between entities under common control are to be initially recorded on the books of the receiving entity at the carrying value of the transferor. Any difference between consideration given and the carrying value of the assets or liabilities is treated as a capital distribution or contribution. Transfer, Exchange or Lease of Compression Equipment with Archrock If Archrock determines in good faith that we or Archrock’s contract operations services business need to transfer, exchange or lease compression equipment between Archrock and us, the Omnibus Agreement permits such equipment to be transferred, exchanged or leased if it will not cause us to breach any existing contracts, suffer a loss of revenue under an existing compression services contract or incur any unreimbursed costs. In consideration for such transfer, exchange or lease of compression equipment, the transferee will either (i) transfer to the transferor compression equipment equal in value to the appraised value of the compression equipment transferred to it, (ii) agree to lease such compression equipment from the transferor or (iii) pay the transferor an amount in cash equal to the appraised value of the compression equipment transferred to it. The TCJA made significant changes to the determination of partnership taxable income that included the cessation of like-kind exchange treatment for exchanges of tangible personal property. In accordance with this change, we no longer perform such exchanges as of January 1, 2018. Transfer and Exchange of Overhauls During the six months ended June 30, 2018 and June 30, 2017 , Archrock contributed to us $1.7 million and $2.7 million , respectively, related to the completion of overhauls on compression equipment that was exchanged with us or contributed to us and where overhauls were in progress on the date of exchange or contribution. Other Exchanges The following table summarizes the like-kind exchange activity between Archrock and us for the six months ended June 30, 2017 prior to the enactment of the TCJA (dollars in thousands): Six Months Ended June 30, 2017 Transferred to Archrock Transferred from Archrock Compressor units 142 119 Horsepower 75,800 69,400 Net book value $ 35,311 $ 32,071 During the six months ended June 30, 2017 , we recorded capital distributions of $3.2 million related to the differences in net book value on the exchanged compression equipment. No customer contracts were included in the exchanges. Leases The following table summarizes the aggregate cost and accumulated depreciation of equipment on lease to and from Archrock (in thousands): June 30, 2018 December 31, 2017 Equipment on lease to Archrock Aggregate cost $ 25,589 $ 3,560 Accumulated depreciation 4,418 272 Equipment on lease from Archrock Aggregate cost $ 47,220 $ 224 Accumulated depreciation 23,272 34 The following table summarizes the revenue from Archrock related to the lease of our compression equipment and the cost of sales related to the lease of Archrock compression equipment (in thousands): Six Months Ended June 30, 2018 2017 Revenue $ 451 $ 61 Cost of sales 906 317 Reimbursement of Operating and SG&A Expense Archrock provides all operational staff, corporate staff and support services reasonably necessary to run our business. These services may include, without limitation, operations, marketing, maintenance and repair, periodic overhauls of compression equipment, inventory management, legal, accounting, treasury, insurance administration and claims processing, risk management, health, safety and environmental, information technology, human resources, credit, payroll, internal audit, taxes, facilities management, investor relations, enterprise resource planning system, training, executive, sales, business development and engineering. Archrock charges us for costs that are directly attributable to us. Costs that are indirectly attributable to us and Archrock’s other operations are allocated among Archrock’s other operations and us. The allocation methodologies vary based on the nature of the charge and have included, among other things, headcount and horsepower. We believe that the allocation methodologies used to allocate indirect costs to us are reasonable.

Contract Costs

Contract Costs	6 Months Ended
	Jun. 30, 2018
Other Income and Expenses [Abstract]
Contract Costs	3. Revenue from Contracts with Customers Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we are entitled to receive in exchange for those goods or services. Sales and usage-based taxes that are collected from the customer are excluded from revenue. The following table presents our revenue from contracts with customers disaggregated by revenue source (in thousands): Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 0 - 1,000 horsepower per unit $ 54,389 $ 108,816 1,001 - 1,500 horsepower per unit 63,390 124,084 Over 1,500 horsepower per unit 32,465 63,900 Other (1) 622 1,068 Total revenue (2) $ 150,866 $ 297,868 —————— (1) Primarily relates to fees associated with Partnership-owned non-compressor equipment. (2) Includes $1.4 million and $2.5 million for three and six months ended June 30, 2018 , respectively, related to billable maintenance on Partnership-owned units that was recognized at a point in time. All other revenue is recognized over time. Contract Operations We provide comprehensive contract operations services, including the personnel, equipment, tools, materials and supplies to meet our customers’ natural gas compression needs. Based on the operating specifications at the customer location and each customer's unique needs, these services include designing, sourcing, owning, installing, operating, servicing, repairing and maintaining equipment to provide natural gas compression services to our customers. Natural gas compression services are generally satisfied over time, as the customer simultaneously receives and consumes the benefits provided by these services. Our performance obligation is a series in which the unit of service is one month, as the customer receives substantially the same benefit each month from the services regardless of the type of service activity performed, which may vary. If the transaction price is based on a fixed fee, revenue is recognized monthly on a straight-line basis over the period that we are providing services to the customer. Amounts invoiced to customers for costs associated with moving our compressor assets to a customer site are also included in the transaction price and are amortized over the initial contract term. Variable consideration exists if customers are billed at a lesser standby rate when a unit is not running. We have elected to apply the invoicing practical expedient to recognize revenue for such variable consideration, as the invoice corresponds directly to the value transferred to the customer based on our performance completed to date. The rate for standby service is lower to reflect the decrease in costs and effort required to provide standby service when a unit is not running. We also perform billable maintenance service on our natural gas compression equipment at the customer’s request on an as-needed basis. The performance obligation is satisfied and revenue is recognized at the agreed-upon transaction price at the point in time when service is complete and the customer has accepted the work performed and can obtain the remaining benefits of the service that the unit will provide. As of June 30, 2018 , we had $209.2 million of remaining performance obligations related to our contract compression service. We have elected the practical expedient to not consider the effects of the time value of money, as the expected time between the transfer of services and payment for such services is less than one year. This amount will be recognized through 2021 as follows (in thousands): 2018 2019 2020 2021 Total Remaining performance obligations $ 115,558 $ 66,981 $ 22,681 $ 3,993 $ 209,213 Contract Balances Contract operations services are generally billed monthly at the beginning of the month in which service is being provided. We recognize a contract asset when we have the right to consideration in exchange for goods or services transferred to a customer when the right is conditioned on something other than the passage of time. We recognize a contract liability when we have an obligation to transfer goods or services to a customer for which we have already received consideration. Freight billings to transport compressor assets often result in a contract liability. As of June 30, and January 1, 2018 , our receivables from contracts with customers, net of allowance for doubtful accounts were $68.7 million and $66.2 million , respectively. As of June 30, and January 1, 2018 , our contract liabilities were $8.1 million and $5.4 million , respectively, which are included in deferred revenue and other long-term liabilities in our condensed consolidated balance sheets. The increase in the contract liability balance was due to the deferral of $8.1 million partially offset by $5.4 million recognized as revenue during the period, each primarily related to freight billings. 5. Contract Costs We capitalize incremental costs to obtain a contract with a customer if we expect to recover those costs. Capitalized costs include commissions paid to our sales force to obtain contract operations contracts. As of June 30, and January 1, 2018, we recorded contract costs of $2.8 million and $2.0 million , respectively, associated with sales commissions. We capitalize costs incurred to fulfill a contract if those costs relate directly to a contract, enhance resources that we will use in satisfying performance obligations and if we expect to recover those costs. Capitalized costs incurred to fulfill our customer contracts include freight charges to transport compressor assets before transferring services to the customer and mobilization activities associated with our contract operations services. As of June 30, and January 1, 2018, we recorded contract costs of $21.9 million and $14.3 million , respectively, associated with freight and mobilization. Contract operations costs are amortized based on the transfer of service to which the assets relate, which is estimated to be 36 months based on average contract term, including anticipated renewals. We assess periodically whether the 36 -month estimate fairly represents the average contract term and adjust as appropriate. Contract costs associated with commissions are amortized to SG&A. Contract costs associated with freight and mobilization are amortized to cost of sales (excluding depreciation and amortization). During the three and six months ended June 30, 2018 , we amortized $0.3 million and $0.5 million , respectively, related to commissions and $2.4 million and $4.3 million , respectively, related to freight and mobilization. During the three and six months ended June 30, 2018 , there were no impairment losses recorded in relation to the costs capitalized.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	6. Long-Term Debt Long-term debt consisted of the following (in thousands): June 30, 2018 December 31, 2017 Credit Facility $ 770,500 $ 674,306 6% senior notes due April 2021 350,000 350,000 Less: Debt discount, net of amortization (2,162 ) (2,523 ) Less: Deferred financing costs, net of amortization (2,825 ) (3,338 ) 345,013 344,139 6% senior notes due October 2022 350,000 350,000 Less: Debt discount, net of amortization (3,108 ) (3,441 ) Less: Deferred financing costs, net of amortization (3,542 ) (3,951 ) 343,350 342,608 Long-term debt $ 1,458,863 $ 1,361,053 Credit Facility The Credit Facility is a five -year, $1.25 billion asset-based revolving credit facility that will mature on March 30, 2022 except that if any portion of our 6% senior notes due April 2021 are outstanding as of December 2, 2020 , then maturity will instead be on December 2, 2020 . In March 2017, we incurred $14.9 million in transaction costs related to the formation of the Credit Facility. Concurrent with entering into the Credit Facility, we expensed $0.6 million of unamortized deferred financing costs and recorded a debt extinguishment loss of $0.3 million related to the termination of our Former Credit Facility. On February 23, 2018, we amended the Credit Facility to, among other things: • increase the maximum Total Debt to EBITDA ratios, as defined in the Credit Facility agreement (see below for the revised ratios), effective as of the execution of Amendment No. 1 on February 23, 2018; and • effective upon completion of the Merger on April 26, 2018: – increase the aggregate revolving commitment from $1.1 billion to $1.25 billion ; – increase the amount available for the issuance of letters of credit from $25.0 million to $50.0 million ; – increase the basket sizes under certain covenants including covenants limiting our ability to make investments, incur debt, make restricted payments, incur liens and make asset dispositions; – name Archrock Services, L.P., one of Archrock’s subsidiaries, as a borrower under the Credit Facility and certain of Archrock’s other subsidiaries as loan guarantors; and – amend the definition of “Borrowing Base” to include certain assets of Archrock’s subsidiaries. We incurred $3.3 million in transaction costs related to Amendment No. 1 which were included in other long-term assets in our condensed consolidated balance sheet and are being amortized over the term of the Credit Facility. On April 26, 2018, in connection with the Merger and Amendment No. 1, Archrock terminated its credit facility and we borrowed on our Credit Facility to repay the $63.2 million in borrowings and accrued and unpaid interest and fees outstanding under the Archrock credit facility, which we recorded as a loan receivable due from Archrock (see Note 4 (“Related Party Transactions”) for further details of the loan receivable). In addition, the $15.4 million of letters of credit outstanding under Archrock’s credit facility as of the Merger were converted to letters of credit under our Credit Facility. As of June 30, 2018 , we had $15.4 million outstanding letters of credit under the Credit Facility and the applicable margin on amounts outstanding was 3.2% . The weighted average annual interest rate on the outstanding balance under the Credit Facility, excluding the effect of interest rate swaps, was 5.5% and 4.8% at June 30, 2018 and December 31, 2017 , respectively. We incurred $0.6 million and $0.5 million in commitment fees on the daily unused amount of the Credit Facility and Former Credit Facility during the three months ended June 30, 2018 and 2017 , respectively, and $1.1 million and $0.9 million during the six months ended June 30, 2018 and 2017 , respectively. We must maintain the following consolidated financial ratios, as defined in the Credit Facility agreement: EBITDA to Interest Expense 2.5 to 1.0 Senior Secured Debt to EBITDA 3.5 to 1.0 Total Debt to EBITDA Through fiscal year 2018 5.95 to 1.0 Through fiscal year 2019 5.75 to 1.0 Through second quarter of 2020 5.50 to 1.0 Thereafter (1) 5.25 to 1.0 —————— (1) Subject to a temporary increase to 5.5 to 1.0 for any quarter during which an acquisition meeting certain thresholds is completed and for the following two quarters after the quarter in which the acquisition closes. As of June 30, 2018 , we had undrawn capacity of $464.1 million under the Credit Facility. As a result of the ratio requirements above, $287.6 million of the $464.1 million of undrawn capacity was available for additional borrowings as of June 30, 2018 . As of June 30, 2018 , we were in compliance with all covenants under the Credit Facility agreement. The Notes The Notes are guaranteed on a senior unsecured basis by all of our existing subsidiaries (other than Archrock Partners Finance Corp., which is a co-issuer of the Notes) and certain of our future subsidiaries. The Notes and the guarantees, respectively, are our and the guarantors’ general unsecured senior obligations, rank equally in right of payment with all of our and the guarantors’ other senior obligations, and are effectively subordinated to all of our and the guarantors’ existing and future secured debt to the extent of the value of the collateral securing such indebtedness. In addition, the Notes and guarantees are effectively subordinated to all existing and future indebtedness and other liabilities of any future non-guarantor subsidiaries. All of our subsidiaries are 100% owned, directly or indirectly, by us and guarantees by our subsidiaries are full and unconditional and constitute joint and several obligations. We have no assets or operations independent of our subsidiaries and there are no significant restrictions upon our subsidiaries’ ability to distribute funds to us. Archrock Partners Finance Corp. has no operations and does not have revenue other than as may be incidental as co-issuer of the Notes. Because we have no independent operations, the guarantees are full and unconditional (subject to customary release provisions) and constitute joint and several obligations of our subsidiaries other than Archrock Partners Finance Corp., and as a result we have not included consolidated financial information of our subsidiaries.

Partners' Capital

Partners' Capital	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Partners' Capital	7. Partners’ Capital On April 26, 2018, Archrock completed the acquisition of all of our outstanding common units. Additionally, our incentive distribution rights, which were previously owned indirectly by Archrock, were canceled and ceased to exist. As a result of the Merger, our common units are no longer publicly traded. See Note 1 (“Organization”) for further details on the Merger. Prior to the Merger, Archrock owned 29,064,637 common units and 1,422,458 general partner units, collectively representing an approximate 43% interest in us. Cash Distributions As of the closing of the Merger, any distributions are paid to Archrock as the owner of all outstanding common and general partner units. In the six months ended June 30, 2018 we paid cash distributions of $0.506 per common unit, or $36.3 million , which covered the period from October 1, 2017 through March 31, 2018. On July 31, 2018 , our board of directors approved a cash distribution of approximately $17.1 million , which covers the period from April 1, 2018 through June 30, 2018.

Unit-Based Compensation

Unit-Based Compensation	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unit-Based Compensation	8. Unit-Based Compensation Long-Term Incentive Plan In April 2017, we adopted the 2017 LTIP to provide for the benefit of the employees, directors and consultants of us, Archrock and our respective affiliates. The 2006 LTIP expired in 2016 and, as such, no further grants have been or can be made under that plan following expiration. Previous grants made under the 2006 LTIP continue to be governed by the 2006 LTIP and the applicable award agreements. Because we grant phantom units to non-employees, we are required to remeasure the fair value of these phantom units, which is based on the fair value of our common units, each period and record a cumulative adjustment of the expense previously recognized. Phantom units granted under the 2017 and 2006 LTIP may include nonforfeitable tandem distribution equivalent rights to receive cash distributions on unvested phantom units in the quarter in which distributions are paid on common units. Phantom units granted generally vest one-third per year on dates as specified in the applicable award agreements subject to continued service through the applicable vesting date. During the three months ended June 30, 2018, 53,091 phantom units vested with a weighted average grant date fair value per unit of $11.24 . Pursuant to the Merger, all outstanding phantom units previously granted under the 2017 and 2006 Partnership LTIP were converted into comparable awards based on Archrock’s common shares. As such, all outstanding phantom units were converted, effective as of the closing of the Merger, into Archrock restricted stock units. See Note 1 (“Organization and Summary of Significant Accounting Policies”) for further details regarding the Merger. Each Archrock restricted stock unit will be subject to the same vesting, forfeiture and other terms and conditions applicable to the converted Partnership phantom units.

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	9. Derivatives We are exposed to market risks associated with changes in interest rates. We use derivative instruments to minimize the risks and costs associated with financial activities by managing our exposure to interest rate fluctuations on a portion of our debt obligations. We do not use derivative instruments for trading or other speculative purposes. At June 30, 2018 , we were a party to the following interest rate swaps, which were entered into to offset changes in expected cash flows due to fluctuations in the associated variable interest rates: Expiration Date Notional Value (in millions) May 2019 $ 100.0 May 2020 100.0 March 2022 300.0 $ 500.0 As of June 30, 2018 , the weighted average effective fixed interest rate on our interest rate swaps was 1.8% . We have designated these interest rate swaps as cash flow hedging instruments so that any change in their fair values is recognized as a component of other comprehensive income (loss) until the hedged transaction affects earnings. At that time, amounts in other comprehensive income (loss) are reclassified into earnings and presented in the same income statement line item as the earnings effect of the hedged item. Prior to adoption of ASU 2017-12, we performed quarterly calculations to determine whether the swap agreements continued to be highly effective at achieving offsetting changes in cash flows attributable to the hedged risk. As the swap terms substantially coincide with the hedged item and are expected to offset changes in expected cash flows due to fluctuations in the variable rate, we expect the hedging relationship to continue to be highly effective. Upon adoption of ASU 2017-12, we perform subsequent quarterly prospective and retrospective hedge effectiveness assessments qualitatively unless facts and circumstances related to the hedging relationships change such that we can no longer assert qualitatively that the cash flow hedge relationships were and continue to be highly effective. We estimate that $2.8 million of deferred gain attributable to interest rate swaps and included in our accumulated other comprehensive income (loss) at June 30, 2018 , will be reclassified into earnings as interest income at then-current values during the next twelve months as the underlying hedged transactions occur. Cash flows from derivatives designated as hedges are classified in our condensed consolidated statements of cash flows under the same category as the cash flows from the underlying assets, liabilities or anticipated transactions, unless the derivative contract contains a significant financing element; in this case, the cash settlements for these derivatives are classified as cash flows from financing activities in our condensed consolidated statements of cash flows. In August 2017, we amended the terms of certain of our interest rate swap agreements, designated as cash flow hedges against the variability of future interest payments due under the Credit Facility, with a notional value of $300.0 million . The amended terms adjusted the fixed interest rate and extended the maturity dates to March 2022. These amendments effectively created new derivative contracts and terminated the old derivative contracts. As a result, as of the amendment date, we discontinued the original cash flow hedge relationships on a prospective basis and designated the amended interest rate swaps under new cash flow hedge relationships based on the amended terms. The fair value of the interest rate swaps immediately prior to the execution of the amendments was a liability of $0.7 million . The associated amount in accumulated other comprehensive income (loss) was amortized into interest expense over the original terms of the interest rate swaps through May 2018. The following tables present the effect of derivative instruments designated as hedging instruments on our consolidated financial position and results of operations (in thousands): Fair Value Asset (Liability) Balance Sheet Location June 30, 2018 December 31, 2017 Current portion of interest rate swaps $ 2,816 $ 186 Other long-term assets 9,050 4,490 Current portion of interest rate swaps — (134 ) $ 11,866 $ 4,542 Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) Derivatives designated as cash flow hedges: Interest rate swaps Three months ended June 30, 2018 $ 2,245 Interest expense, net $ 6 Three months ended June 30, 2017 (336 ) Interest expense, net (799 ) Six months ended June 30, 2018 6,941 Interest expense, net (449 ) Six months ended June 30, 2017 363 Interest expense, net (1,775 ) Location and Amount of Gain (Loss) Recognized in Income on Cash Flow Hedging Relationships Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Interest Expense, Net Total amount of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded $ 22,542 $ 44,151 Interest Contracts: Amount of gain reclassified from accumulated other comprehensive income into income $ 207 $ 153 The counterparties to our derivative agreements are major financial institutions. We monitor the credit quality of these financial institutions and do not expect non-performance by any counterparty, although such non-performance could have a material adverse effect on us. We have no specific collateral posted for our derivative instruments.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	10. Fair Value Measurements The accounting standard for fair value measurements and disclosures establishes a fair value hierarchy that prioritizes the inputs of valuation techniques used to measure fair value into the following three categories: • Level 1 — Quoted unadjusted prices for identical instruments in active markets to which we have access at the date of measurement. • Level 2 — Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Level 2 inputs are those in markets for which there are few transactions, the prices are not current, little public information exists or prices vary substantially over time or among brokered market makers. • Level 3 — Model-derived valuations in which one or more significant inputs or significant value drivers are unobservable. Unobservable inputs are those inputs that reflect our own assumptions regarding how market participants would price the asset or liability based on the best available information. Assets and Liabilities Measured at Fair Value on a Recurring Basis On a quarterly basis, our interest rate swaps are valued based on the income approach (discounted cash flow) using market observable inputs, including forward London Interbank Offered Rate curves. These fair value measurements are classified as Level 2. The following table presents our interest rate swaps asset and liability measured at fair value on a recurring basis with pricing levels as of the date of valuation (in thousands): June 30, 2018 December 31, 2017 Interest rate swaps asset $ 11,866 $ 4,676 Interest rate swaps liability — (134 ) Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis During the six months ended June 30, 2018 , we recorded non-recurring fair value measurements related to our idle and previously-culled compressor units. Our estimate of the compressor units’ fair value was primarily based on either the expected net sale proceeds compared to other fleet units we recently sold and/or a review of other units recently offered for sale by third parties, or the estimated component value of the equipment we plan to use. We discounted the expected proceeds, net of selling and other carrying costs, using a weighted average disposal period of four years . These fair value measurements are classified as Level 3. The fair value of our impaired compressor units was $0.7 million and $1.8 million at June 30, 2018 and December 31, 2017 , respectively. See Note 11 (“Long-Lived Asset Impairment”) for further details. Other Financial Instruments The carrying amounts of our cash, receivables and payables approximate fair value due to the short-term nature of those instruments. The carrying amounts of borrowings outstanding under our Credit Facility approximate fair value due to their variable interest rates. The fair value of these outstanding borrowings was estimated using a discounted cash flow analysis based on interest rates offered on loans with similar terms to borrowers of similar credit quality, which are Level 3 inputs. The fair value of our fixed rate debt was estimated based on quoted prices in inactive markets and is considered a Level 2 measurement. The following table summarizes the carrying amount and fair value of our fixed rate debt (in thousands): June 30, 2018 December 31, 2017 Carrying amount of fixed rate debt (1) $ 688,363 $ 686,747 Fair value of fixed rate debt 696,000 702,000 —————— (1) Carrying amounts are shown net of unamortized debt discounts and unamortized deferred financing costs. See Note 6 (“Long-Term Debt”) for further details.

Long-Lived Asset Impairment

Long-Lived Asset Impairment	6 Months Ended
	Jun. 30, 2018
Asset Impairment Charges [Abstract]
Long-Lived Asset Impairment	11. Long-Lived Asset Impairment We review long-lived assets, including property, plant and equipment and identifiable intangibles that are being amortized, for impairment whenever events or changes in circumstances, including the removal of compressor units from our active fleet, indicate that the carrying amount of an asset may not be recoverable. We periodically review the future deployment of our idle compression assets for units that are not of the type, configuration, condition, make or model that are cost efficient to maintain and operate. Based on these reviews, we determine that certain idle compressor units should be retired from the active fleet. The retirement of these units from the active fleet triggers a review of these assets for impairment and as a result of our review, we may record an asset impairment to reduce the book value of each unit to its estimated fair value. The fair value of each unit is estimated based on the expected net sale proceeds compared to other fleet units we recently sold, a review of other units recently offered for sale by third parties or the estimated component value of the equipment we plan to use. In connection with our review of our idle compression assets, we evaluate for impairment idle units that were culled from our fleet in prior years and are available for sale. Based on that review, we may reduce the expected proceeds from disposition and record additional impairment to reduce the book value of each unit to its estimated fair value. The following table presents the results of our impairment review (dollars in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Idle compressor units retired from the active fleet 70 40 105 105 Horsepower of idle compressor units retired from the active fleet 17,000 13,000 30,000 35,000 Impairment recorded on idle compressor units retired from the active fleet $ 3,846 $ 3,081 $ 6,912 $ 9,291

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. Commitments and Contingencies Insurance Matters Our business can be hazardous, involving unforeseen circumstances such as uncontrollable flows of natural gas or well fluids and fires or explosions. Archrock insures our property and operations against many, but not all, of these risks. We believe that our insurance coverage is customary for the industry and adequate for our business; however, losses and liabilities not covered by insurance would increase our costs. In addition, Archrock is substantially self-insured for worker’s compensation, employer’s liability, property, auto liability, general liability and employee group health claims in view of the relatively high per-incident deductibles it absorbs under its insurance arrangements for these risks. Losses up to the deductible amounts are estimated and accrued based upon known facts, historical trends and industry averages. Tax Matters We are subject to a number of state and local taxes that are not income-based. As many of these taxes are subject to audit by the taxing authorities, it is possible that an audit could result in additional taxes due. We accrue for such additional taxes when we determine that it is probable that we have incurred a liability and we can reasonably estimate the amount of the liability. As of June 30, 2018 and December 31, 2017 , we accrued $2.4 million and $1.6 million , respectively, for the outcomes of non-income based tax audits. We do not expect that the ultimate resolutions of these audits will result in a material variance from the amounts accrued. We do not accrue for unasserted claims for tax audits unless we believe the assertion of a claim is probable, it is probable that it will be determined that the claim is owed and we can reasonably estimate the claim or range of the claim. We believe the likelihood is remote that the impact of potential unasserted claims from non-income based tax audits could be material to our consolidated financial position, but it is possible that the resolution of future audits could be material to our consolidated results of operations or cash flows for the period in which the resolution occurs. Litigation and Claims In the ordinary course of business, we are involved in various pending or threatened legal actions. While management is unable to predict the ultimate outcome of these actions, it believes that any ultimate liability arising from any of these actions will not have a material adverse effect on our consolidated financial position, results of operations or cash flows, including our ability to make cash distributions to our unitholders. However, because of the inherent uncertainty of litigation and arbitration proceedings, we cannot provide assurance that the resolution of any particular claim or proceeding to which we are a party will not have a material adverse effect on our consolidated financial position, results of operations or cash flows, including our ability to make cash distributions to our unitholders. Heavy Equipment In 2011, the Texas Legislature enacted changes related to the appraisal of natural gas compressors for ad valorem tax purposes by expanding the definitions of “Heavy Equipment Dealer” and “Heavy Equipment” effective from the beginning of 2012. Under the revised Heavy Equipment Statutes, we believe we are a Heavy Equipment Dealer, that our natural gas compressors are Heavy Equipment and that we, therefore, are required to file our ad valorem taxes under this new methodology. We further believe that our natural gas compressors are taxable under the Heavy Equipment Statutes in the counties where we maintain a business location and keep natural gas compressors instead of where the compressors may be located on January 1 of a tax year. As a result of this new methodology, our ad valorem tax expense (which is reflected in our condensed consolidated statements of operations as a component of cost of sales (excluding depreciation and amortization expense)) includes a benefit of $8.8 million during the six months ended June 30, 2018 . Since the change in methodology became effective in 2012, we have recorded an aggregate benefit of $75.0 million as of June 30, 2018 , of which $18.2 million has been agreed to by a number of appraisal review boards and county appraisal districts and $56.8 million has been disputed and is currently in litigation. A large number of appraisal review boards denied our position, although some accepted it, and we filed 82 petitions for review in the appropriate district courts with respect to the 2012 tax year, 93 petitions for review in the appropriate district courts with respect to the 2013 tax year, 103 petitions for review in the appropriate district courts with respect to the 2014 tax year, 111 petitions for review in the appropriate district courts with respect to the 2015 tax year, 105 petitions for review in the appropriate district courts with respect to the 2016 tax year and 108 petitions for review in the appropriate district courts with respect to the 2017 tax year. To date, only five cases have advanced to the point of trial or submission of summary judgment motions on the merits, and only three cases have been decided, with two of the decisions having been rendered by the same presiding judge. All three of those decisions were appealed, and all three of the appeals have been decided by intermediate appellate courts. On October 17, 2013, the 143rd Judicial District Court of Loving County, Texas ruled in EXLP Leasing LLC & EES Leasing LLC v. Loving County Appraisal District that our wholly-owned subsidiary, Archrock Partners Leasing LLC, formerly known as EXLP Leasing, and Archrock’s subsidiary, Archrock Services Leasing LLC, formerly known as EES Leasing, are Heavy Equipment Dealers and that their compressors qualify as Heavy Equipment, but the district court further held that the Heavy Equipment Statutes were unconstitutional as applied to EXLP Leasing’s and EES Leasing’s compressors. EXLP Leasing and EES Leasing appealed the district court’s constitutionality holding to the Eighth Court of Appeals in El Paso, Texas. On September 23, 2015, the Eighth Court of Appeals ruled in EXLP Leasing’s and EES Leasing’s favor by overruling the 143rd District Court’s constitutionality ruling. The Eighth Court of Appeals also ruled, however, that EXLP Leasing’s and EES Leasing’s natural gas compressors are taxable in the counties where they were located on January 1 of the tax year at issue. On October 28, 2013, the 143rd Judicial District Court of Ward County, Texas ruled in EES Leasing LLC & EXLP Leasing LLC v. Ward County Appraisal District that EXLP Leasing and EES Leasing are Heavy Equipment Dealers and that their compressors qualify as Heavy Equipment, but the court held that the Heavy Equipment Statutes were unconstitutional as applied to their compressors. EXLP Leasing and EES Leasing appealed the district court’s constitutionality holding to the Eighth Court of Appeals in El Paso, Texas, and the Ward County Appraisal District cross-appealed the district court’s rulings that EXLP Leasing’s and EES Leasing’s compressors qualify as Heavy Equipment. On September 23, 2015, the Eighth Court of Appeals ruled in EXLP Leasing’s and EES Leasing’s favor by overruling the 143rd District Court’s constitutionality ruling and affirming its ruling that EXLP Leasing’s and EES Leasing’s compressors qualify as Heavy Equipment. The Eighth Court of Appeals also ruled, however, that EXLP Leasing’s and EES Leasing’s natural gas compressors are taxable in the counties where they were located on January 1 of the tax year at issue. The Ward County Appraisal District and Loving County Appraisal District each filed (on January 27, 2016 and February 10, 2016, respectively) a petition asking the Texas Supreme Court to review its respective Eighth Court of Appeals decision. On March 11, 2016, EXLP Leasing and EES Leasing filed responses to the appraisal districts’ petitions and cross-petitions for review in each case asking the Texas Supreme Court to also review the Eighth Court of Appeals’ determination that natural gas compressors are taxable in the counties where they were located on January 1 of the tax year at issue. The Ward County Appraisal District filed its response to EXLP Leasing’s and EES Leasing’s cross-petition on June 6, 2016, and EXLP Leasing and EES Leasing filed their reply on June 21, 2016. The Loving County Appraisal District filed its response to EXLP Leasing’s and EES Leasing’s cross-petition on May 27, 2016, and EXLP Leasing and EES Leasing filed their reply on June 10, 2016. On March 18, 2014, the 10th Judicial District Court of Galveston, Texas ruled in EXLP Leasing LLC & EES Leasing LLC v. Galveston Central Appraisal District that EXLP Leasing and EES Leasing are Heavy Equipment Dealers and that their compressors qualify as Heavy Equipment, but the court held the Heavy Equipment Statutes unconstitutional as applied to their compressors. EXLP Leasing and EES Leasing appealed the district court’s constitutionality holding to the Fourteenth Court of Appeals in Houston, Texas. On August 25, 2015, the Fourteenth Court of Appeals issued a ruling stating that EXLP Leasing’s and EES Leasing’s compressors are taxable in the counties where they were located on January 1 of the tax year at issue, and it remanded the case to the district court for further evidence on the issue of whether the Heavy Equipment Statutes are constitutional as applied to EXLP Leasing’s and EES Leasing’s compressors. On November 24, 2015, EXLP Leasing and EES Leasing filed a petition asking the Texas Supreme Court to review this decision. On March 21, 2016, the Galveston Central Appraisal District filed a response to EXLP Leasing’s and EES Leasing’s petition for review, and EXLP Leasing and EES Leasing filed their reply on April 26, 2016. In EES Leasing v. Irion County Appraisal District , EES Leasing and the appraisal district each filed motions for summary judgment in the 51st District Court concerning the applicability and constitutionality of the Heavy Equipment Statutes. On May 20, 2014, the district court entered an order denying both motions for summary judgment, holding that a fact issue existed as to the applicability of the Heavy Equipment Statutes to the one compressor at issue. The presiding judge for the 51st District Court has since consolidated the 2012 tax year case with EES Leasing’s 2013 tax year case, which also included EXLP Leasing as a party. On August 27, 2015, the presiding judge abated the combined case, EES Leasing LLC and EXLP Leasing LLC v. Irion County Appraisal District , until the final resolution of the appellate cases considering the constitutionality of the Heavy Equipment Statutes, or further order of the court. EXLP Leasing and EES Leasing also filed a motion for summary judgment in EES Leasing LLC & EXLP Leasing LLC v. Harris County Appraisal District , pending in the 189th Judicial District Court of Harris County, Texas. The court heard arguments on the motion on December 6, 2013 but has yet to rule. No trial date has been set. On June 3, 2015, the Fourth Court of Appeals in San Antonio, Texas issued a decision reversing the 406th District Court’s dismissal of EXLP Leasing’s and EES Leasing’s tax appeals for want of jurisdiction. In EXLP Leasing LLC et. al v. Webb County Appraisal District , United Independent School District (“United ISD”) intervened as a party in interest and sought to dismiss the lawsuit arguing that the district court was without jurisdiction to hear the appeal. Under Section 42.08(b) of the Texas Tax Code, a property owner must pay before the delinquency date the lesser of (1) the amount of taxes due on the portion of the taxable value of the property that is not in dispute or (2) the amount of taxes due on the property under the order from which the appeal is taken. EXLP Leasing and EES Leasing paid zero taxes to Webb County because the entire amount of tax assessed by Webb County was in dispute. Instead, as required by the Heavy Equipment Statutes and Texas Comptroller forms, EXLP Leasing and EES Leasing paid taxes on the compressors at issue to Victoria County, where they maintain their place of business and keep natural gas compressors. The Webb County Appraisal District and United ISD contested EXLP Leasing’s and EES Leasing’s position that the Heavy Equipment Statutes contain situs provisions requiring that taxes be paid where the dealer has a business location and keeps its natural gas compressors, instead arguing that taxes are payable to the county where each compressor is located as of January 1 of the tax year at issue. The district court granted United ISD’s motion to dismiss on April 1, 2014 and declined EXLP Leasing’s and EES Leasing’s motion to reconsider. The Fourth Court of Appeals reversed, holding that, based on the plain meaning of Section 42.08(b)(1), and because the entire amount was in dispute, EXLP Leasing and EES Leasing were not required to prepay disputed taxes to invoke the trial court’s jurisdiction. The Fourth Court of Appeals denied United ISD’s request for a rehearing. On September 29, 2015, United ISD filed a petition for review in the Texas Supreme Court. On December 4, 2015, the Texas Supreme Court denied United ISD’s petition for review. United ISD has four delinquency lawsuits concerning the 2012 tax year pending against EXLP Leasing and EES Leasing in the 49th District Court of Webb County, Texas. The cases have been abated pending the resolution of EXLP Leasing’s and EES Leasing’s 2012 tax year case pending in the 406th Judicial District Court of Webb County, Texas. On September 2, 2016, the Texas Supreme Court requested that consolidated merits briefs be filed in EXLP Leasing’s and EES Leasing’s cases against the Loving County Appraisal District, Ward County Appraisal District, and Galveston Central Appraisal District, as well as two similar cases involving different taxpayers. On September 19, 2016, the Supreme Court entered a consolidated briefing schedule for the five cases. Consolidated briefing was completed on February 7, 2017. On March 10, 2017, the Texas Supreme Court granted EXLP Leasing’s and EES Leasing’s petition for review in EXLP Leasing LLC & EES Leasing LLC v. Galveston Central Appraisal District . The case was argued before the Texas Supreme Court on October 10, 2017. On March 2, 2018, the Texas Supreme Court ruled in favor of EXLP Leasing and EES Leasing by reversing the Fourteenth Court of Appeals’ decision. In doing so, the Supreme Court upheld the validity of the Heavy Equipment Rules and held that compressors are taxable in the county of EXLP Leasing’s and EES Leasing’s business location, not where each compressor is located on January 1. On April 2, 2018, the Galveston Central Appraisal District filed a motion for rehearing. On April 3, 2018, EXLP Leasing and EES Leasing filed a letter stating that they do not plan to file a response to Galveston Central Appraisal District’s motion for rehearing unless the Texas Supreme Court requests they do so. We continue to believe that the revised statutes are constitutional as applied to natural gas compressors and that under the revised statutes our natural gas compressors are taxable in the counties where we maintain a business location and keep natural gas compressors. Recognizing the similarity of the issues and that these cases will ultimately be resolved by the Texas appellate courts, most of the remaining 2012-2017 district court cases have been formally or effectively abated pending final judgment from the Texas Supreme Court. If we are unsuccessful in our litigation, we would be required to pay ad valorem taxes up to the aggregate benefit we have recorded, and the additional ad valorem tax payments may also be subject to substantial penalties and interest. In addition, while we do not expect the ultimate determination of the issue of where the natural gas compressors are taxable under the Heavy Equipment Statutes would have an impact on the amount of taxes due, we could be subject to substantial penalties if we are unsuccessful on this issue. Also, if we are unsuccessful in our litigation, or if legislation is enacted in Texas that repeals or alters the Heavy Equipment Statutes such that in the future we do not qualify as a Heavy Equipment Dealer or our compressors do not qualify as Heavy Equipment, then we would likely be required to pay these ad valorem taxes under the old methodology going forward, which would increase our quarterly cost of sales expense up to approximately the amount of our then-most recent quarterly benefit recorded. If this litigation is resolved against us in whole or in part, or if in the future we do not qualify as a Heavy Equipment Dealer or our compressors do not qualify as Heavy Equipment because of new or revised Texas statutes, we will incur additional taxes and could be subject to substantial penalties and interest, which would impact our future results of operations, financial position and cash flows, including our cash available for distribution.

Organization (Policies)

Organization (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Accounting Standards Updates	Accounting Standards Updates Implemented On January 1, 2018, we adopted ASU 2017-12 using the modified retrospective approach to existing cash flow hedge relationships as of January 1, 2018. ASU 2017-12 expands and refines hedge accounting for both financial and nonfinancial risk components, aligns the recognition and presentation of the effects of the hedging instrument and hedged item in the financial statements and eliminates the requirement to separately measure and report hedge ineffectiveness. As a result of the adoption of ASU 2017-12, we recognized a net gain of $0.4 million as a cumulative-effect adjustment to opening retained earnings and a corresponding adjustment to other comprehensive income (loss) to reverse the cumulative ineffectiveness previously recognized in interest expense. On January 1, 2018, we adopted ASU 2016-15 on a retrospective basis. ASU 2016-15 addresses diversity in practice and simplifies several elements of cash flow classification including how certain cash receipts and cash payments are classified in the statement of cash flows. ASU 2016-15 did not have an impact on our condensed consolidated statement of cash flow for the six months ended June 30, 2017 . Revenue Recognition Update On January 1, 2018, we adopted the Revenue Recognition Update using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. We recognized the cumulative effect of initially applying the Revenue Recognition Update as an adjustment to the opening balance of retained earnings. For contracts that were modified before the effective date, we identified performance obligations on the basis of the current version of the contract, which included any contract modifications since inception. The application of the practical expedient for contract modifications did not have a material effect on the adjustment to retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Under previous guidance, contract operations revenue was recognized when earned, which generally occurs monthly when the service is provided under our customer contracts. Under the Revenue Recognition Update the timing of revenue recognition is impacted by contractual provisions for service availability guarantees of our compressor assets and re-billable costs associated with moving our compressor assets to a customer site. These changes are further discussed below and did not result in a material difference from previous practice for contract operations. The Revenue Recognition Update provides guidance on contract costs that should be recognized as assets and amortized over the period that the related goods or services transfer to the customer. Certain costs that were previously expensed as incurred, such as sales commissions and freight charges to transport compressor assets, are deferred and amortized. The following table summarizes the cumulative impact of the adoption of the Revenue Recognition Update on the opening balance sheet (in thousands): December 31, 2017 Adjustments Due to the Revenue Recognition Update January 1, 2018 Assets Contract costs $ — $ 16,316 $ 16,316 Liabilities Accrued liabilities $ 7,597 $ 186 $ 7,783 Deferred revenue 1,299 3,416 4,715 Partners ’ capital Common units $ 501,023 $ 12,462 $ 513,485 General partner units 11,582 252 11,834 The following tables summarize the impact of the application of the Revenue Recognition Update on our condensed consolidated balance sheet and condensed consolidated statement of operations (in thousands): June 30, 2018 Balance Sheet As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Assets Accounts receivable, trade $ 69,391 $ 69,237 $ 154 Contract costs 24,660 — 24,660 Liabilities Accrued liabilities $ 9,546 $ 9,349 $ 197 Deferred revenue 7,730 1,497 6,233 Other long-term liabilities 8,596 8,608 (12 ) Equity Common units $ 497,875 $ 479,895 $ 17,980 General partner units 11,543 11,127 416 Three Months Ended June 30, 2018 Statement of Operations As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Revenue $ 150,866 $ 151,798 $ (932 ) Cost of sales (excluding depreciation and amortization) 60,226 63,740 (3,514 ) Selling, general and administrative 19,344 19,671 (327 ) Benefit from income taxes (417 ) (393 ) (24 ) Net income 10,481 7,548 2,933 Six Months Ended June 30, 2018 Statement of Operations As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Revenue $ 297,868 $ 300,543 $ (2,675 ) Cost of sales (excluding depreciation and amortization) 116,528 124,037 (7,509 ) Selling, general and administrative 39,145 39,981 (836 ) Provision for income taxes 102 114 (12 ) Net income 20,771 15,089 5,682 Accounting Standards Updates Not Yet Implemented In June 2016, the FASB issued ASU 2016-13 that changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019 and early adoption is permitted. Entities will apply ASU 2016-13 provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. We are currently evaluating the impact of ASU 2016-13 on our consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02 that establishes a ROU model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Under the new guidance, lessor accounting is largely unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach that involves recasting the comparative periods in the year of initial application is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain optional transition practical expedients available. We intend to adopt ASU 2016-02 on January 1, 2019 and are currently assessing the practical expedients. Though our assessment of the impact of the adoption of ASU 2016-02 is ongoing, we anticipate significant changes to our consolidated balance sheets and disclosures based on the requirements prescribed by the new standard. We do not believe the standard will materially affect our consolidated statements of operations. We are in the process of assessing changes to our internal control structure and will continue to evaluate our business processes, systems and accounting policies that are necessary to implement this standard.

Recent Accounting Developments

Recent Accounting Developments (Tables)	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table summarizes the cumulative impact of the adoption of the Revenue Recognition Update on the opening balance sheet (in thousands): December 31, 2017 Adjustments Due to the Revenue Recognition Update January 1, 2018 Assets Contract costs $ — $ 16,316 $ 16,316 Liabilities Accrued liabilities $ 7,597 $ 186 $ 7,783 Deferred revenue 1,299 3,416 4,715 Partners ’ capital Common units $ 501,023 $ 12,462 $ 513,485 General partner units 11,582 252 11,834 The following tables summarize the impact of the application of the Revenue Recognition Update on our condensed consolidated balance sheet and condensed consolidated statement of operations (in thousands): June 30, 2018 Balance Sheet As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Assets Accounts receivable, trade $ 69,391 $ 69,237 $ 154 Contract costs 24,660 — 24,660 Liabilities Accrued liabilities $ 9,546 $ 9,349 $ 197 Deferred revenue 7,730 1,497 6,233 Other long-term liabilities 8,596 8,608 (12 ) Equity Common units $ 497,875 $ 479,895 $ 17,980 General partner units 11,543 11,127 416 Three Months Ended June 30, 2018 Statement of Operations As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Revenue $ 150,866 $ 151,798 $ (932 ) Cost of sales (excluding depreciation and amortization) 60,226 63,740 (3,514 ) Selling, general and administrative 19,344 19,671 (327 ) Benefit from income taxes (417 ) (393 ) (24 ) Net income 10,481 7,548 2,933 Six Months Ended June 30, 2018 Statement of Operations As Reported Balance Excluding the Impact of the Revenue Recognition Update Effect of Change Revenue $ 297,868 $ 300,543 $ (2,675 ) Cost of sales (excluding depreciation and amortization) 116,528 124,037 (7,509 ) Selling, general and administrative 39,145 39,981 (836 ) Provision for income taxes 102 114 (12 ) Net income 20,771 15,089 5,682

Revenue from Contracts with C22

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents our revenue from contracts with customers disaggregated by revenue source (in thousands): Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 0 - 1,000 horsepower per unit $ 54,389 $ 108,816 1,001 - 1,500 horsepower per unit 63,390 124,084 Over 1,500 horsepower per unit 32,465 63,900 Other (1) 622 1,068 Total revenue (2) $ 150,866 $ 297,868 —————— (1) Primarily relates to fees associated with Partnership-owned non-compressor equipment. (2) Includes $1.4 million and $2.5 million for three and six months ended June 30, 2018 , respectively, related to billable maintenance on Partnership-owned units that was recognized at a point in time. All other revenue is recognized over time.

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table summarizes the aggregate cost and accumulated depreciation of equipment on lease to and from Archrock (in thousands): June 30, 2018 December 31, 2017 Equipment on lease to Archrock Aggregate cost $ 25,589 $ 3,560 Accumulated depreciation 4,418 272 Equipment on lease from Archrock Aggregate cost $ 47,220 $ 224 Accumulated depreciation 23,272 34 The following table summarizes the revenue from Archrock related to the lease of our compression equipment and the cost of sales related to the lease of Archrock compression equipment (in thousands): Six Months Ended June 30, 2018 2017 Revenue $ 451 $ 61 Cost of sales 906 317 The following table summarizes the like-kind exchange activity between Archrock and us for the six months ended June 30, 2017 prior to the enactment of the TCJA (dollars in thousands): Six Months Ended June 30, 2017 Transferred to Archrock Transferred from Archrock Compressor units 142 119 Horsepower 75,800 69,400 Net book value $ 35,311 $ 32,071

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following (in thousands): June 30, 2018 December 31, 2017 Credit Facility $ 770,500 $ 674,306 6% senior notes due April 2021 350,000 350,000 Less: Debt discount, net of amortization (2,162 ) (2,523 ) Less: Deferred financing costs, net of amortization (2,825 ) (3,338 ) 345,013 344,139 6% senior notes due October 2022 350,000 350,000 Less: Debt discount, net of amortization (3,108 ) (3,441 ) Less: Deferred financing costs, net of amortization (3,542 ) (3,951 ) 343,350 342,608 Long-term debt $ 1,458,863 $ 1,361,053 We must maintain the following consolidated financial ratios, as defined in the Credit Facility agreement: EBITDA to Interest Expense 2.5 to 1.0 Senior Secured Debt to EBITDA 3.5 to 1.0 Total Debt to EBITDA Through fiscal year 2018 5.95 to 1.0 Through fiscal year 2019 5.75 to 1.0 Through second quarter of 2020 5.50 to 1.0 Thereafter (1) 5.25 to 1.0 —————— (1) Subject to a temporary increase to 5.5 to 1.0 for any quarter during which an acquisition meeting certain thresholds is completed and for the following two quarters after the quarter in which the acquisition closes.

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	At June 30, 2018 , we were a party to the following interest rate swaps, which were entered into to offset changes in expected cash flows due to fluctuations in the associated variable interest rates: Expiration Date Notional Value (in millions) May 2019 $ 100.0 May 2020 100.0 March 2022 300.0 $ 500.0
Effect of Derivative Instruments on Consolidated Financial Position	The following tables present the effect of derivative instruments designated as hedging instruments on our consolidated financial position and results of operations (in thousands): Fair Value Asset (Liability) Balance Sheet Location June 30, 2018 December 31, 2017 Current portion of interest rate swaps $ 2,816 $ 186 Other long-term assets 9,050 4,490 Current portion of interest rate swaps — (134 ) $ 11,866 $ 4,542
Effect of Derivative Instruments on Results of Operations	Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) Derivatives designated as cash flow hedges: Interest rate swaps Three months ended June 30, 2018 $ 2,245 Interest expense, net $ 6 Three months ended June 30, 2017 (336 ) Interest expense, net (799 ) Six months ended June 30, 2018 6,941 Interest expense, net (449 ) Six months ended June 30, 2017 363 Interest expense, net (1,775 ) Location and Amount of Gain (Loss) Recognized in Income on Cash Flow Hedging Relationships Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Interest Expense, Net Total amount of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded $ 22,542 $ 44,151 Interest Contracts: Amount of gain reclassified from accumulated other comprehensive income into income $ 207 $ 153

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis with Pricing Levels as of The Date of Valuation	The following table presents our interest rate swaps asset and liability measured at fair value on a recurring basis with pricing levels as of the date of valuation (in thousands): June 30, 2018 December 31, 2017 Interest rate swaps asset $ 11,866 $ 4,676 Interest rate swaps liability — (134 )
Schedule of Carrying Value and Estimated Fair Value of Debt Instruments	The following table summarizes the carrying amount and fair value of our fixed rate debt (in thousands): June 30, 2018 December 31, 2017 Carrying amount of fixed rate debt (1) $ 688,363 $ 686,747 Fair value of fixed rate debt 696,000 702,000 —————— (1) Carrying amounts are shown net of unamortized debt discounts and unamortized deferred financing costs. See Note 6 (“Long-Term Debt”) for further details.

Long-Lived Asset Impairment (Ta

Long-Lived Asset Impairment (Tables)	6 Months Ended
	Jun. 30, 2018
Asset Impairment Charges [Abstract]
Details of Impairment of Long-Lived Assets Held and Used by Asset	The following table presents the results of our impairment review (dollars in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Idle compressor units retired from the active fleet 70 40 105 105 Horsepower of idle compressor units retired from the active fleet 17,000 13,000 30,000 35,000 Impairment recorded on idle compressor units retired from the active fleet $ 3,846 $ 3,081 $ 6,912 $ 9,291

Organization (Narratives) (Deta

Organization (Narratives) (Details)	Apr. 26, 2018shares
Business Acquisition
Ownership interest held by public unitholders in the reporting entity (as a percent)	57.00%
Common stock
Business Acquisition
Share conversion rate	1.40
Common stock | Archrock
Business Acquisition
Business acquisition, shares issued (shares)	57,600,000
Business acquisition, shares acquired (shares)	41,200,000

Recent Accounting Development29

Recent Accounting Developments (Narratives) (Details) - ASU 2017-12 - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle
Impact of adoption of new accounting principle		$ 383
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle
Impact of adoption of new accounting principle	$ 400
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle
Impact of adoption of new accounting principle	$ (400)

Recent Accounting Development30

Recent Accounting Developments - Balance Sheet Impact (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, trade	$ 69,391		$ 67,714
Contract costs	24,660	$ 16,316	0
Liabilities
Accrued liabilities	9,546	7,783	7,597
Deferred revenue	7,730	4,715	1,299
Other long-term liabilities	8,596		9,356
Partners’ capital
Common units	497,875	513,485	501,023
General partner units	11,543	11,834	11,582
Balance Excluding the Impact of the Revenue Recognition Update
Assets
Accounts receivable, trade	69,237
Contract costs	0		0
Liabilities
Accrued liabilities	9,349		7,597
Deferred revenue	1,497		1,299
Other long-term liabilities	8,608
Partners’ capital
Common units	479,895		501,023
General partner units	11,127		$ 11,582
Adjustments Due to the Revenue Recognition Update | ASU 2014-09
Assets
Accounts receivable, trade	154
Contract costs	24,660	16,316
Liabilities
Accrued liabilities	197	186
Deferred revenue	6,233	3,416
Other long-term liabilities	(12)
Partners’ capital
Common units	17,980	12,462
General partner units	$ 416	$ 252

Recent Accounting Development31

Recent Accounting Developments - Income Statement Impact (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition
Revenue	$ 150,866	$ 138,255	$ 297,868	$ 275,550
Cost of sales (excluding depreciation and amortization)	60,226	53,995	116,528	110,272
Selling, general and administrative	19,344	18,303	39,145	38,614
Provision for (benefit from) income taxes	(417)	960	102	2,262
Net income	10,481	$ 5,275	20,771	$ 959
Balance Excluding the Impact of the Revenue Recognition Update
Revenue, Initial Application Period Cumulative Effect Transition
Revenue	151,798		300,543
Cost of sales (excluding depreciation and amortization)	63,740		124,037
Selling, general and administrative	19,671		39,981
Provision for (benefit from) income taxes	(393)		114
Net income	7,548		15,089
Adjustments Due to the Revenue Recognition Update | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition
Revenue	(932)		(2,675)
Cost of sales (excluding depreciation and amortization)	(3,514)		(7,509)
Selling, general and administrative	(327)		(836)
Provision for (benefit from) income taxes	(24)		(12)
Net income	$ 2,933		$ 5,682

Revenue from Contracts with C32

Revenue from Contracts with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue
Contract revenue	$ 150,866	$ 138,255	$ 297,868	$ 275,550
0 - 1,000 horsepower per unit
Disaggregation of Revenue
Contract revenue	54,389		108,816
1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	63,390		124,084
Over 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	32,465		63,900
Other
Disaggregation of Revenue
Contract revenue	622		1,068
Other | Transferred at point in time
Disaggregation of Revenue
Contract revenue	$ 1,400		$ 2,500

Revenue from Contracts with C33

Revenue from Contracts with Customers - Remaining Performance Obligation (Details) $ in Thousands	Jun. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 209,213
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 115,558
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 66,981
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 22,681
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 3,993
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	1 year

Revenue from Contracts with C34

Revenue from Contracts with Customers - Contract with Client (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contract assets with customer	$ 68.7	$ 66.2
Contract liability with customer	8.1	$ 5.4
Increase in contract liability from freight billing	8.1
Revenue from contract liability	$ 5.4

Related Party Transactions (Nar

Related Party Transactions (Narratives) (Details) $ in Thousands	Apr. 26, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)contract	Dec. 31, 2017USD ($)
Related party transactions
Repayments of long-term debt			$ 176,636	$ 756,500
Loan receivable due from Archrock		$ 60,500	60,500		$ 0
Interest income from notes receivable		$ 600	600
Archrock
Related party transactions
Amount contributed by related party related to completion of overhauls on compression equipment			$ 1,700	2,700
Distributions recorded related to differences in net book value of compressor units exchanged to our assets transferred to related party				$ 3,200
Number of customer contracts included in transfers | contract				0
Revolving Credit Facility | Credit Facility | Archrock
Related party transactions
Repayments of long-term debt	$ 63,200

Related Party Transactions - Tr

Related Party Transactions - Transfers (Details) - Archrock $ in Thousands	3 Months Ended
	Jun. 30, 2017USD ($)compressor_unithp
Related party transactions
Number of compressor units transferred to a related party | compressor_unit	142
Horsepower of compressor units transferred to related party | hp	75,800
Net book value of compressor units transferred to related party | $	$ 35,311
Number of compressor units transferred by related party | compressor_unit	119
Horsepower of compressor units transferred by related party | hp	69,400
Net book value of compressor units transferred by related party | $	$ 32,071

Related Party Transactions - Ag

Related Party Transactions - Aggregate Cost and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Related party transactions
Accumulated depreciation	$ 978,550	$ 953,325
Archrock | Equipment Leased to Other Party
Related party transactions
Aggregate cost	25,589	3,560
Accumulated depreciation	4,418	272
Archrock | Equipment Leased From Other Party
Related party transactions
Aggregate cost	47,220	224
Accumulated depreciation	$ 23,272	$ 34

Related Party Transactions - Re

Related Party Transactions - Revenue From Related Party (Details) - Archrock - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Related party transactions
Revenue	$ 451	$ 61
Cost of sales	$ 906	$ 317

Contract Costs (Details)

Contract Costs (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue
Contract costs	$ 24,660,000	$ 24,660,000		$ 16,316,000	$ 0
Capitalized contract, term		36 months
Amortization of contract costs		$ 4,758,000	$ 0
Impairment loss on customer contracts	0	0
Sales Commissions
Disaggregation of Revenue
Contract costs	2,800,000	2,800,000		2,000,000
Amortization of contract costs	300,000	500,000
Freight and Mobilization
Disaggregation of Revenue
Contract costs	21,900,000	21,900,000		$ 14,300,000
Amortization of contract costs	$ 2,400,000	$ 4,300,000

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long-Term Debt
Long-term debt	$ 1,458,863	$ 1,361,053
6% senior notes due April 2021 | Senior Notes
Long-Term Debt
Long-term debt, gross	350,000	350,000
Less: Debt discount, net of amortization	(2,162)	(2,523)
Less: Deferred financing costs, net of amortization	(2,825)	(3,338)
Long-term debt	$ 345,013	344,139
Interest rate (as a percent)	6.00%
6% senior notes due October 2022 | Senior Notes
Long-Term Debt
Long-term debt, gross	$ 350,000	350,000
Less: Debt discount, net of amortization	(3,108)	(3,441)
Less: Deferred financing costs, net of amortization	(3,542)	(3,951)
Long-term debt	$ 343,350	342,608
Interest rate (as a percent)	6.00%
Revolving Credit Facility | Credit Facility
Long-Term Debt
Long-term debt	$ 770,500	$ 674,306
Interest rate (as a percent)	6.00%

Long-Term Debt - Revolving Cred

Long-Term Debt - Revolving Credit Facility (Details) - USD ($)	Apr. 26, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Long-Term Debt
Repayments of long-term debt					$ 176,636,000	$ 756,500,000
Letters of credit outstanding			$ 15,400,000		$ 15,400,000
Revolving Credit Facility
Long-Term Debt
Transaction costs	$ 3,300,000
Weighted average interest rate (percentage)			5.50%	4.80%	5.50%	4.80%
Commitment fees			$ 600,000	$ 500,000	$ 1,100,000	$ 900,000
Revolving Credit Facility | Credit Facility
Long-Term Debt
Line of credit facility, period	5 years
Maximum borrowing capacity	$ 1,250,000,000		$ 1,250,000,000		$ 1,250,000,000		$ 1,100,000,000
Interest rate (as a percent)			6.00%		6.00%
Transaction costs		$ 14,900,000
Letters of credit outstanding	15,400,000
Line of credit remaining borrowing capacity			$ 464,100,000		$ 464,100,000
Revolving Credit Facility | Credit Facility | Maximum
Long-Term Debt
Line of credit remaining borrowing capacity			$ 287,600,000		$ 287,600,000
Revolving Credit Facility | Credit Facility | Archrock
Long-Term Debt
Repayments of long-term debt	63,200,000
Revolving Credit Facility | Term loan facility due May 2018
Long-Term Debt
Debt issuance cost expensed		600,000
Loss on extinguishment of debt		$ 300,000
Letter of credit | Credit Facility
Long-Term Debt
Maximum borrowing capacity	$ 50,000,000						$ 25,000,000
Line of Credit | Base Rate
Long-Term Debt
Spread on variable rate					3.20%

Long-Term Debt - Debt Ratios (D

Long-Term Debt - Debt Ratios (Details)	6 Months Ended		12 Months Ended		21 Months Ended
	Jun. 30, 2020	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 30, 2022
Forecasted | Revolving Credit Facility | Conditional Event
Line of Credit Facility
Total debt to EBITDA ratio					5.5
Exterran Partners LP
Line of Credit Facility
EBITDA to total interest expenses ratio		2.5
Senior secured debt to EBITDA ratio		3.5
Exterran Partners LP | Forecasted
Line of Credit Facility
Total debt to EBITDA ratio	5.5		5.75	5.95	5.25

Long-Term Debt - Senior Notes (

Long-Term Debt - Senior Notes (Details)	Jun. 30, 2018USD ($)
Debt Disclosure [Abstract]
Ownership percentage (as a percent)	100.00%
Amount of independent assets or operations	$ 0

Partners' Capital (Narratives)

Partners' Capital (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 25, 2018	Jun. 30, 2018	Jun. 30, 2017	Jul. 31, 2018
Partners' Equity, Allocations and Cash Distributions
Distributions to unitholders		$ 36,291	$ 38,231
Archrock
Partners' Equity, Allocations and Cash Distributions
Common units owned (in units)		29,064,637
Archrock | Archrock Partners, L.P
Partners' Equity, Allocations and Cash Distributions
General partner's ownership interest in partnership (as a percent)		43.00%
Partners' Capital General Partner Units | Archrock
Partners' Equity, Allocations and Cash Distributions
Units issued in connection with acquisition (in units)		1,422,458
Subsequent Event
Partners' Equity, Allocations and Cash Distributions
Distribution per common unit (in dollars per unit)	$ 0.506
Authorized distributions to limited partnership, amount				$ 17,100

Unit-Based Compensation - Long-

Unit-Based Compensation - Long-term Incentive Plan (Details) - Phantom Units - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Long-Term Incentive Plan
Unit-Based Compensation
Vested (in units)	53,091
Vested (in dollars per unit)	$ 11.24
First anniversary vesting
Unit-Based Compensation
Vesting percentage		33.33%
Second anniversary vesting
Unit-Based Compensation
Vesting percentage		33.33%
Third anniversary vesting
Unit-Based Compensation
Vesting percentage		33.33%

Derivatives - Interest Rate Ris

Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments - USD ($)	Jun. 30, 2018	Aug. 31, 2017
Interest rate swaps
Accounting for Derivatives
Notional amount of interest rate swaps	$ 500,000,000
May 2,019
Accounting for Derivatives
Notional amount of interest rate swaps	100,000,000
May 2,020
Accounting for Derivatives
Notional amount of interest rate swaps	100,000,000
March 2,022
Accounting for Derivatives
Notional amount of interest rate swaps	$ 300,000,000	$ 300,000,000

Derivatives - Interest Rate R47

Derivatives - Interest Rate Risk (Narratives) (Details) - Derivatives designated as hedging instruments - USD ($)	Jun. 30, 2018	Aug. 31, 2017
Interest rate swaps
Accounting for Derivatives
Weighted average effective fixed interest rate on interest rate swaps (as a percent)	1.80%
Deferred gain to be reclassified during next 12 months	$ 2,800,000
Notional amount of interest rate swaps	500,000,000
March 2,022
Accounting for Derivatives
Notional amount of interest rate swaps	$ 300,000,000	$ 300,000,000
Derivative liability, fair value		$ 700,000

Derivatives - Effect on Derivat

Derivatives - Effect on Derivative Instruments on the Balance Sheet (Details) - Derivatives designated as hedging instruments - Interest rate swaps - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounting for Derivatives
Derivative asset, net	$ 11,866	$ 4,542
Current portion of interest rate swaps
Accounting for Derivatives
Derivative asset	2,816	186
Other long-term assets
Accounting for Derivatives
Derivative asset	9,050	4,490
Current portion of interest rate swaps
Accounting for Derivatives
Derivative liability	$ 0	$ (134)

Derivatives - Effect on Deriv49

Derivatives - Effect on Derivative Instruments on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effect of derivative instruments on results of operations
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	$ 2,245	$ (336)	$ 6,941	$ 363
Interest expense, net
Effect of derivative instruments on results of operations
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss)	$ 6	$ (799)	$ (449)	$ (1,775)

Derivatives - Derivative Gain (

Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effect of derivative instruments on results of operations
Interest expense, net	$ 22,542	$ 21,299	$ 44,151	$ 41,522
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Effect of derivative instruments on results of operations
Interest expense, net	$ 207		$ 153

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Recurring basis - Level 2 - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair value measurements
Interest rate swaps asset	$ 11,866	$ 4,676
Interest rate swaps liability	$ 0	$ (134)

Fair Value Measurements (Narrat

Fair Value Measurements (Narratives) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Nonrecurring basis | Level 3
Fair value measurements
Impaired long-lived assets	$ 0.7	$ 1.8
Impaired long-lived assets
Fair value measurements
Weighted average disposal period used in estimation of the fair value of the impaired long-lived assets	4 years

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Debt (Details) - Fixed Rate Debt - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	$ 688,363	$ 686,747
Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	$ 696,000	$ 702,000

Long-Lived Asset Impairment (De

Long-Lived Asset Impairment (Details) hp in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)compressor_unithp	Jun. 30, 2017USD ($)compressor_unithp	Jun. 30, 2018USD ($)compressor_unithp	Jun. 30, 2017USD ($)compressor_unithp
Long-lived asset impairment
Impairment recorded on idle compressor units retired from the active fleet	$ 3,846	$ 3,081	$ 6,912	$ 9,291
Idle compressor units
Long-lived asset impairment
Idle compressor units retired from the active fleet (compressors) | compressor_unit	70	40	105	105
Horsepower of idle compressor units retired from the active fleet (horsepower) | hp	17	13	30	35
Impairment recorded on idle compressor units retired from the active fleet	$ 3,846	$ 3,081	$ 6,912	$ 9,291

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	6 Months Ended	78 Months Ended
	Jun. 30, 2018USD ($)claim	Jun. 30, 2018USD ($)claim	Dec. 31, 2017USD ($)petition	Dec. 31, 2016petition	Sep. 19, 2016claim	Dec. 31, 2015petition	Dec. 31, 2014petition	Dec. 31, 2013petition	Dec. 31, 2012petition
Loss Contingencies [Line Items]
Accrual for income tax liability | $	$ 2.4	$ 2.4	$ 1.6
Ad valorem tax benefit | $	8.8	75
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | $	18.2	18.2
Ad valorem tax benefit in litigation | $	$ 56.8	$ 56.8
Number of petitions | petition			108	105		111	103	93	82
Number of pending claims	5	5
Number of claims settled	3
Number of claims appealed	3	3
Judge
Loss Contingencies [Line Items]
Number of claims settled	2
United ISD
Loss Contingencies [Line Items]
Number of pending claims	4	4			5