Archrock Partners (APLP) 10-Q 30 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 29, 2019
Document and Entity Information
Entity Registrant Name	Archrock Partners, L.P.
Entity Central Index Key	0001367064
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		70,231,036
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Emerging Growth Company	false
Entity Small Business	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 183	$ 264
Accounts receivable, trade, net of allowance of $965 and $1,253, respectively	81,119	80,606
Tax refund receivable	0	14,000
Derivative asset	2,428	3,185
Other current assets	109	123
Total current assets	83,839	98,178
Property, plant and equipment	3,054,144	2,933,568
Accumulated depreciation	(1,066,098)	(1,042,182)
Property, plant and equipment, net	1,988,046	1,891,386
Intangible assets, net	42,371	45,839
Contract costs, net	33,606	32,220
Loan receivable due from Archrock	21,350	20,000
Other assets	14,286	17,801
Total assets	2,183,498	2,105,424
Current liabilities:
Accounts payable, trade	23,611	10,646
Accrued liabilities	12,922	10,129
Deferred revenue	8,858	9,577
Accrued interest	23,147	11,999
Due to Archrock, net	1,002	17,251
Total current liabilities	69,540	59,602
Long-term debt	1,582,217	1,529,501
Other liabilities	9,694	9,175
Total liabilities	1,661,451	1,598,278
Commitments and contingencies (Note 11)
Partners’ capital:
Common units: 70,231,036 issued and outstanding	506,032	488,209
General partner units: 1,422,458 issued and outstanding	11,933	11,630
Accumulated other comprehensive income	4,082	7,307
Total partners’ capital	522,047	507,146
Total liabilities and partners’ capital	$ 2,183,498	$ 2,105,424

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, trade, allowance (in dollars)	$ 965	$ 1,253
Common units, issued (in units)	70,231,036	70,231,036
Common units, outstanding (in units)	70,231,036	70,231,036
General partner units, issued (in units)	1,422,458	1,422,458
General partner units, outstanding (in units)	1,422,458	1,422,458

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 165,719	$ 147,002
Cost of sales (excluding depreciation and amortization)	67,724	56,302
Selling, general and administrative	21,107	19,801
Depreciation and amortization	35,376	34,326
Long-lived asset impairment	2,684	3,066
Interest expense, net	23,428	21,609
Merger-related costs	0	1,376
Other (income) loss, net	552	(287)
Income before income taxes	14,848	10,809
Provision for income taxes	529	519
Net income	$ 14,319	$ 10,290

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 14,319	$ 10,290
Other comprehensive income (loss):
Interest rate swap gain (loss), net of reclassifications to earnings	(3,225)	4,985
Amortization of terminated interest rate swaps	0	166
Total other comprehensive income (loss)	(3,225)	5,151
Comprehensive income	$ 11,094	$ 15,441

CONDENSED CONSOLIDATED STATEM_3

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, 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
Issuance of general partner units (in units)					690
Contribution (Distributions) of capital, net	1,825			$ 1,825
Cash distributions	(20,455)			(20,050)	$ (405)
Unit-based compensation expense	314			314
Contribution of capital - excess of fair market value of equipment sold to Archrock over equipment purchased from Archrock	0
Comprehensive income
Net income	10,290			10,086	204
Interest rate swap gain (loss), net of reclassifications to earnings	4,985		4,985
Amortization of terminated interest rate swaps	166		166
Ending balance at Mar. 31, 2018	524,721	$ (2,591)	9,627	$ 506,035	$ 11,650
Ending balance (in units) at Mar. 31, 2018		(132,645)		70,363,681	1,422,458
Beginning balance at Dec. 31, 2018	507,146	$ 0	7,307	$ 488,209	$ 11,630
Beginning balance (in units) at Dec. 31, 2018		0		70,231,036	1,422,458
Increase (Decrease) in Partners' Capital
Contribution (Distributions) of capital, net	(1,836)			$ (1,780)	$ (56)
Cash distributions	(17,197)			(16,855)	(342)
Contribution of capital - excess of fair market value of equipment sold to Archrock over equipment purchased from Archrock	1,840			1,840
Cash contributions from Archrock	21,000			20,583	417
Comprehensive income
Net income	14,319			14,035	284
Interest rate swap gain (loss), net of reclassifications to earnings	(3,225)		(3,225)
Amortization of terminated interest rate swaps	0
Ending balance at Mar. 31, 2019	$ 522,047	$ 0	$ 4,082	$ 506,032	$ 11,933
Ending balance (in units) at Mar. 31, 2019		0		70,231,036	1,422,458

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Partners' Capital [Abstract]
Distribution per common unit (in dollars per unit)	$ 0.240	$ 0.285

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 14,319	$ 10,290
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	35,376	34,326
Long-lived asset impairment	2,684	3,066
Amortization of deferred financing costs	1,509	1,353
Amortization of debt discount	366	344
Amortization of terminated interest rate swaps	0	166
Interest rate swaps	(410)	257
Unit-based compensation expense	0	314
Provision for (benefit from) doubtful accounts	(30)	118
(Gain) loss on sale of property, plant and equipment	587	(256)
Deferred income tax provision	416	391
Amortization of contract costs	4,180	2,101
Deferred revenue recognized in earnings	(4,768)	(2,237)
Changes in assets and liabilities:
Accounts and other receivables	7,936	(1,639)
Contract costs	(5,566)	(6,604)
Deferred revenue	4,150	4,119
Other assets and liabilities	12,384	11,613
Net cash provided by operating activities	73,133	57,722
Cash flows from investing activities:
Capital expenditures	(124,541)	(60,555)
Proceeds from sale of property, plant and equipment	9,173	10,377
Proceeds from insurance	238	136
Loans receivable from Archrock, net	(1,350)	0
Net cash used in investing activities	(116,480)	(50,042)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	690,000	73,830
Repayments of long-term debt	(629,000)	(61,136)
Payments for debt issuance costs	(7,521)	(2,316)
(Payments for) proceeds from settlement of interest rate swaps that include financing elements	393
(Payments for) proceeds from settlement of interest rate swaps that include financing elements		(205)
Distributions to unitholders	(17,197)	(20,455)
Contributions from Archrock	21,000	0
Net proceeds from sale of general partner units	0	9
Purchases of treasury units	0	(250)
Decrease in amounts due to affiliates, net	(14,409)	(3,772)
Net cash provided by (used in) financing activities	43,266	(14,295)
Net decrease in cash	(81)	(6,615)
Cash at beginning of period	264	8,078
Cash at end of period	183	1,463
Supplemental disclosure of non-cash transactions:
Non-cash capital contribution, net from limited partner	1,031	1,825
Contract operations equipment acquired, net	(2,867)	0
Non-cash capital contribution from Archrock	$ 1,840	$ 0

Organization and Basis of Prese

Organization and Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Organization and Basis of Presentation	1. Organization and Basis of Presentation We are a leading provider of natural gas compression services to customers in the oil and natural gas industry 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. In April 2018, Archrock completed the acquisition of all of our outstanding common units that it did not already own and, as a result, we became its wholly-owned subsidiary. See Note 10 (“Partners’ Capital”) for further details of the Merger. The accompanying unaudited condensed consolidated financial statements included herein have been prepared in accordance with GAAP 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 2018 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. Omission of Information by Certain Wholly-Owned Subsidiaries

Recent Accounting Developments

Recent Accounting Developments	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Developments	2. Recent Accounting Developments Accounting Standards Updates Implemented Leases ASC 842 Leases establishes a ROU model that requires a lessee to record a ROU asset and a lease liability on the balance sheet. Leases are 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. We are a party to leases in our contract operations services agreements. We adopted ASC 842 Leases on January 1, 2019, and have determined that ASC 842 Leases will not have an impact on our condensed consolidated financial statements. ASC 842 Leases provides several practical expedients, one of which is for lessors to not separate lease and nonlease components and instead account for those components as a single component if the nonlease components otherwise would be accounted for under the Revenue Recognition Update and certain conditions are met. ASC 842 Leases also provides clarification for lessors on whether ASC 842 Leases or the Revenue Recognition Update is applicable to the combined component based on determination of the predominant component. We have concluded that for our contract operations services agreements, in which we are the lessor, the services nonlease component is predominant over the compression unit lease component and therefore ongoing recognition of these agreements will continue to follow the Revenue Recognition Update guidance. Accounting Standards Updates Not Yet Implemented In August 2018, the FASB issued ASU 2018-13 which amends the required fair value measurements disclosures related to valuation techniques and inputs used, uncertainty in measurement and changes in measurements applied. These amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. We are currently evaluating the impact of ASU 2018-13 on our consolidated financial statements and footnote disclosures.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	3. Related Party Transactions Revolving Loan Agreement with Archrock In conjunction with the closing of the Merger, 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. At March 31, 2019 , the balance of outstanding borrowings under the Revolving Loan Agreement was $21.4 million . During the three months ended March 31, 2019 , we recorded $0.2 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. 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 received is treated as a capital distribution or contribution. Sales of Compression Equipment with Archrock If Archrock determines in good faith that we or Archrock’s contract operations services business needs to sell compression equipment between Archrock and us, the Omnibus Agreement permits such transactions if it will not cause us to breach any existing contracts, suffer a loss of revenue under any existing contract operations services contracts or incur any unreimbursed costs. As consideration for the sale of compression equipment, the transferee will make a distribution to or receive a contribution from the transferor in an amount equal to the net book value of the compression equipment sold. The following table summarizes compressor unit sales activity between Archrock and us (dollars in thousands): Three Months Ended Sold to Archrock Purchased from Archrock Compressor units 11 30 Horsepower 8,441 10,089 Net book value $ 6,993 $ 4,126 During the three months ended March 31, 2019 , we recorded a capital distribution of $2.9 million related to the difference in net book value of the compression equipment sold to and acquired from Archrock. In addition, in accordance with the Omnibus Agreement, we recorded a capital contribution of $1.8 million which represented the net excess of the fair market value of the equipment sold to Archrock over the equipment purchased from Archrock. No customer contracts were included in these sales. Transfers of Overhauls During the three months ended March 31, 2019 and 2018 , Archrock contributed to us $1.0 million and $1.8 million , respectively, related to the completion of overhauls on compression equipment that was sold to us and where the overhauls were in progress on the date of the sale. 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.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-Term Debt	4. Long-Term Debt Long-term debt consisted of the following (in thousands): March 31, 2019 December 31, 2018 Credit Facility $ 400,500 $ 839,500 6.875% senior notes due April 2027 500,000 — Less: Deferred financing costs, net of amortization (9,111 ) — 490,889 — 6% senior notes due April 2021 350,000 350,000 Less: Debt discount, net of amortization (1,598 ) (1,789 ) Less: Deferred financing costs, net of amortization (2,055 ) (2,311 ) 346,347 345,900 6% senior notes due October 2022 350,000 350,000 Less: Debt discount, net of amortization (2,590 ) (2,766 ) Less: Deferred financing costs, net of amortization (2,929 ) (3,133 ) 344,481 344,101 Long-term debt $ 1,582,217 $ 1,529,501 Credit Facility As of March 31, 2019 , we had $15.2 million letters of credit outstanding under the Credit Facility and the applicable margin on borrowings outstanding was 2.7% . The weighted average annual interest rate on the outstanding balance under the Credit Facility, excluding the effect of interest rate swaps, was 5.3% and 5.4% at March 31, 2019 and December 31, 2018 , respectively. We incurred $0.5 million in commitment fees on the daily unused amount of the Credit Facility during each of the three months ended March 31, 2019 and 2018 . We must maintain the following consolidated financial ratios, as defined in our 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 satisfying certain thresholds is completed and for the two quarters immediately following such quarter. As a result of the ratio requirements above, $485.8 million of the $834.3 million of undrawn capacity was available for additional borrowings as of March 31, 2019 . As of March 31, 2019 , we were in compliance with all covenants under the Credit Facility agreement. 2027 Notes On March 21, 2019, we completed a private offering of $500.0 million aggregate principal amount of 6.875% senior notes due April 2027. We received net proceeds of $490.9 million after deducting issuance costs. The $9.1 million of issuance costs were recorded as deferred financing costs within long-term debt in our condensed consolidated balance sheets and are being amortized to interest expense in our condensed consolidated statement of operations over the term of the notes. The net proceeds were used to repay borrowings outstanding under our Credit Facility as of March 31, 2019. In April 2019, we borrowed on our Credit Facility to repay the $350.0 million of our 6% senior notes due April 2021. See Note 12 (“Subsequent Events”) for further details of the redemption. The 2027 Notes have not been and will not be registered under the Securities Act or the securities laws of any other jurisdiction and may not be offered or sold in the U.S. except pursuant to a registration exemption under the Securities Act and applicable state securities laws. We offered and issued the 2027 Notes only to qualified institutional buyers in accordance with Rule 144A under the Securities Act and to certain non-U.S. persons outside the U.S. in accordance with Regulation S under the Securities Act. The 2027 Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by Archrock and all of its existing subsidiaries, other than Archrock Partners, L.P. and APLP Finance Corp., which are co-issuers of the 2027 Notes, and certain of its future subsidiaries. The 2027 Notes and the guarantees rank equally in right of payment with all of Archrock and the guarantors’ existing and future senior indebtedness. Prior to April 1, 2022, we may redeem all or part of the 2027 Notes at a redemption price equal to 100% of the principal amount of the 2027 Notes plus a make-whole premium plus accrued and unpaid interest, if any. We may also redeem up to 35% of the aggregate principal amount of the 2027 Notes prior to April 1, 2022 with the net proceeds of one or more equity offerings at a redemption price of 106.875% of the principal amount of the 2027 Notes plus any accrued and unpaid interest as long as at least 65% of the aggregate principal amount of the 2027 Notes remains outstanding after such redemption and the redemption occurs within 180 days of the closing of such equity offering. On or after April 1, 2022, we may redeem all or part of the 2027 Notes at redemption prices equal to 105.156% , 103.438% and 101.719% for the 12-month periods beginning on April 1, 2022, 2023 and 2024, respectively, and 100.000% beginning on April 1, 2025 and at any time thereafter, plus any accrued and unpaid interest. 6% Notes The 6% 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 6% Notes) and certain of our future subsidiaries. The 6% 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 6% 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 6%

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	5. Revenue from Contracts with Customers Disaggregation of Revenue The following table presents our revenue from contracts with customers disaggregated by revenue source (in thousands): Three Months Ended 2019 2018 0 - 1,000 horsepower per unit $ 58,161 $ 54,427 1,001 - 1,500 horsepower per unit 68,207 60,694 Over 1,500 horsepower per unit 39,025 31,435 Other (1) 326 446 Total revenue (2) $ 165,719 $ 147,002 —————— (1) Primarily relates to fees associated with Partnership-owned non-compressor equipment. (2) Includes $2.1 million and $1.1 million for the three months ended March 31, 2019 and 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. Performance Obligations As of March 31, 2019 , we had $261.3 million of remaining performance obligations related to our contract operations segment. We have elected to apply 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. The remaining performance obligations will be recognized through 2022 as follows (in thousands): 2019 2020 2021 2022 2023 Total Remaining performance obligations $ 162,137 $ 77,913 $ 19,075 $ 2,170 $ 20 $ 261,315 Contract Balances As of March 31, 2019 and December 31, 2018 , our receivables from contracts with customers, net of allowance for doubtful accounts were $78.7 million and $78.6 million , respectively. As of March 31, 2019 and December 31, 2018 , our contract liabilities were $9.1 million and $9.7 million , respectively, which are included in deferred revenue and other liabilities in our condensed consolidated balance sheets. Freight billings to customers for the transport of compressor assets often result in a contract liability. During the three months ended March 31, 2019 and 2018 we recognized $4.8 million and $2.2 million

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	6. Derivatives We are exposed to market risks associated with changes in the variable interest rate of the Partnership Credit Facility. We use derivative instruments to manage our exposure to fluctuations in this variable interest rate and thereby minimize the risks and costs associated with financial activities. We do not use derivative instruments for trading or other speculative purposes. At March 31, 2019 , 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 (in millions): Expiration Date Notional Value May 2019 $ 100 May 2020 100 March 2022 300 $ 500 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. We have designated these interest rate swaps as cash flow hedging instruments and so any change in their fair value is recognized as a component of other comprehensive income (loss) until the hedged transaction affects earnings. At that time, amounts are reclassified into earnings to interest expense, net, the same statement of operations line item to which the earnings effect of the hedged item is recorded. 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. We expect the hedging relationship to be highly effective 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 perform quarterly qualitative prospective and retrospective hedge effectiveness assessments 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. During the three months ended March 31, 2019, we performed a quantitative assessment of hedge effectiveness. The results indicated the interest rate swap cash flow hedge relationship was and continues to be highly effective. We estimate that $2.4 million of the deferred gain attributable to interest rate swaps included in accumulated other comprehensive income at March 31, 2019 will be reclassified into earnings as interest income at then-current values during the next 12 months as the underlying hedged transactions occur. As of March 31, 2019 , the weighted average effective fixed interest rate on our interest rate swaps was 1.8% . The following table presents the effect of our derivative instruments designated as cash flow hedging instruments on our condensed consolidated balance sheets (in thousands): Fair Value Asset (Liability) March 31, 2019 December 31, 2018 Derivative asset $ 2,428 $ 3,185 Other assets 1,654 4,122 $ 4,082 $ 7,307 The following tables present the effect of our derivative instruments designated as cash flow hedging instruments on our condensed consolidated statements of operations (in thousands): Three Months Ended 2019 2018 Pre-tax gain (loss) recognized in other comprehensive income (loss) $ (2,299 ) $ 4,696 Pre-tax gain (loss) reclassified from accumulated other comprehensive income into interest expense, net 926 (455 ) Three Months Ended 2019 2018 Total amount of interest expense, net in which the effects of cash flow hedges are recorded $ 23,428 $ 21,609 Amount of gain (loss) reclassified from accumulated other comprehensive income into interest expense, net 926 (54 ) See Note 7 (“Fair Value Measurements”)

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	7. 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 London Interbank Offered Rate forward curves. These fair value measurements are classified as Level 2. Our interest rate swap assets measured at fair value on a recurring basis with pricing levels as of March 31, 2019 and December 31, 2018 were $4.1 million and $7.3 million , respectively. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis During the three months ended March 31, 2019 , 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 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 $0.3 million and $1.0 million at March 31, 2019 and December 31, 2018 , respectively. See Note 8 (“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 amount of borrowings outstanding under our Credit Facility approximates fair value due to its variable interest rate. 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): March 31, 2019 December 31, 2018 Carrying amount of fixed rate debt (1) $ 1,181,717 $ 690,001 Fair value of fixed rate debt 1,216,000 674,000 —————— (1) Carrying amounts are shown net of unamortized debt discounts and unamortized deferred financing costs. See Note 4 (“Long-Term Debt”)

Long-Lived Asset Impairment

Long-Lived Asset Impairment	3 Months Ended
	Mar. 31, 2019
Asset Impairment Charges [Abstract]
Long-Lived Asset Impairment	8. 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 2019 2018 Idle compressor units retired from the active fleet 15 35 Horsepower of idle compressor units retired from the active fleet 13,000 13,000 Impairment recorded on idle compressor units retired from the active fleet $ 2,684 $ 3,066

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes Unrecognized Tax Benefits As of March 31, 2019 , we believe it is reasonably possible that $1.2 million

Partners' Capital

Partners' Capital	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Partners' Capital	10. Partners’ Capital Merger Transaction In April 2018, Archrock completed the acquisition of all of our outstanding common units and we became a wholly-owned subsidiary of Archrock. Additionally, all outstanding treasury units were retired and our incentive distribution rights, all of which were previously owned 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 6% Notes were not impacted by the Merger. Prior to the Merger, at March 31, 2018, public unitholders held a 57% ownership interest in us and Archrock owned our remaining equity interests, including 29,064,637 common units and 1,422,458 general partner units, collectively representing a 43% interest. 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. On April 26, 2019 , our board of directors approved a cash distribution of $0.24 per common unit, or approximately $17.2 million

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. 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 each of March 31, 2019 and December 31, 2018 , we accrued $3.2 million 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. Litigation and Claims

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events On April 5, 2019, we borrowed on the Credit Facility to repay our 6% senior notes due April 2021. The notes were redeemed at 100% of their $350.0 million aggregate principal amount plus accrued and unpaid interest of $0.2 million . We will record a debt extinguishment loss of approximately $3.7 million

Recent Accounting Developments

Recent Accounting Developments Recent Accounting Developments (Policies)	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Standards Updates Implemented and Accounting Standards Updates Not Yet Implemented	Accounting Standards Updates Implemented Leases ASC 842 Leases establishes a ROU model that requires a lessee to record a ROU asset and a lease liability on the balance sheet. Leases are 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. We are a party to leases in our contract operations services agreements. We adopted ASC 842 Leases on January 1, 2019, and have determined that ASC 842 Leases will not have an impact on our condensed consolidated financial statements. ASC 842 Leases provides several practical expedients, one of which is for lessors to not separate lease and nonlease components and instead account for those components as a single component if the nonlease components otherwise would be accounted for under the Revenue Recognition Update and certain conditions are met. ASC 842 Leases also provides clarification for lessors on whether ASC 842 Leases or the Revenue Recognition Update is applicable to the combined component based on determination of the predominant component. We have concluded that for our contract operations services agreements, in which we are the lessor, the services nonlease component is predominant over the compression unit lease component and therefore ongoing recognition of these agreements will continue to follow the Revenue Recognition Update guidance. Accounting Standards Updates Not Yet Implemented In August 2018, the FASB issued ASU 2018-13 which amends the required fair value measurements disclosures related to valuation techniques and inputs used, uncertainty in measurement and changes in measurements applied. These amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. We are currently evaluating the impact of ASU 2018-13 on our consolidated financial statements and footnote disclosures.

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table summarizes compressor unit sales activity between Archrock and us (dollars in thousands): Three Months Ended Sold to Archrock Purchased from Archrock Compressor units 11 30 Horsepower 8,441 10,089 Net book value $ 6,993 $ 4,126

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following (in thousands): March 31, 2019 December 31, 2018 Credit Facility $ 400,500 $ 839,500 6.875% senior notes due April 2027 500,000 — Less: Deferred financing costs, net of amortization (9,111 ) — 490,889 — 6% senior notes due April 2021 350,000 350,000 Less: Debt discount, net of amortization (1,598 ) (1,789 ) Less: Deferred financing costs, net of amortization (2,055 ) (2,311 ) 346,347 345,900 6% senior notes due October 2022 350,000 350,000 Less: Debt discount, net of amortization (2,590 ) (2,766 ) Less: Deferred financing costs, net of amortization (2,929 ) (3,133 ) 344,481 344,101 Long-term debt $ 1,582,217 $ 1,529,501 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

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2019
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 2019 2018 0 - 1,000 horsepower per unit $ 58,161 $ 54,427 1,001 - 1,500 horsepower per unit 68,207 60,694 Over 1,500 horsepower per unit 39,025 31,435 Other (1) 326 446 Total revenue (2) $ 165,719 $ 147,002 —————— (1) Primarily relates to fees associated with Partnership-owned non-compressor equipment. (2) Includes $2.1 million and $1.1 million for the three months ended March 31, 2019
Remaining Performance Obligation Satisfaction	As of March 31, 2019 , we had $261.3 million of remaining performance obligations related to our contract operations segment. We have elected to apply 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. The remaining performance obligations will be recognized through 2022 as follows (in thousands): 2019 2020 2021 2022 2023 Total Remaining performance obligations $ 162,137 $ 77,913 $ 19,075 $ 2,170 $ 20 $ 261,315

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	At March 31, 2019 , 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 (in millions): Expiration Date Notional Value May 2019 $ 100 May 2020 100 March 2022 300 $ 500
Effect of Derivative Instruments on Consolidated Financial Position	The following table presents the effect of our derivative instruments designated as cash flow hedging instruments on our condensed consolidated balance sheets (in thousands): Fair Value Asset (Liability) March 31, 2019 December 31, 2018 Derivative asset $ 2,428 $ 3,185 Other assets 1,654 4,122 $ 4,082 $ 7,307
Effect of Derivative Instruments on Results of Operations	The following tables present the effect of our derivative instruments designated as cash flow hedging instruments on our condensed consolidated statements of operations (in thousands): Three Months Ended 2019 2018 Pre-tax gain (loss) recognized in other comprehensive income (loss) $ (2,299 ) $ 4,696 Pre-tax gain (loss) reclassified from accumulated other comprehensive income into interest expense, net 926 (455 ) Three Months Ended 2019 2018 Total amount of interest expense, net in which the effects of cash flow hedges are recorded $ 23,428 $ 21,609 Amount of gain (loss) reclassified from accumulated other comprehensive income into interest expense, net 926 (54 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
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): March 31, 2019 December 31, 2018 Carrying amount of fixed rate debt (1) $ 1,181,717 $ 690,001 Fair value of fixed rate debt 1,216,000 674,000 —————— (1) Carrying amounts are shown net of unamortized debt discounts and unamortized deferred financing costs. See Note 4 (“Long-Term Debt”)

Long-Lived Asset Impairment (Ta

Long-Lived Asset Impairment (Tables)	3 Months Ended
	Mar. 31, 2019
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 2019 2018 Idle compressor units retired from the active fleet 15 35 Horsepower of idle compressor units retired from the active fleet 13,000 13,000 Impairment recorded on idle compressor units retired from the active fleet $ 2,684 $ 3,066

Related Party Transactions (Nar

Related Party Transactions (Narratives) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Related party transactions
Loan receivable due from Archrock	$ 21,350		$ 20,000
Distributions recorded related to differences in net book value of compressor units exchanged to our assets transferred to related party	2,867	$ 0
Non-cash capital contribution from Archrock	1,840	0
Affiliated Entity | Archrock
Related party transactions
Loan receivable due from Archrock	21,400
Interest income from notes receivable	200
Distributions recorded related to differences in net book value of compressor units exchanged to our assets transferred to related party	2,900
Non-cash capital contribution from Archrock	$ 1,800
Number of customer contracts included in transfers | contract	0
Amount contributed by related party related to completion of overhauls on compression equipment	$ 1,000	$ 1,800

Related Party Transactions - Tr

Related Party Transactions - Transfers (Details) - Archrock - Affiliated Entity $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)compressor_unithp
Related party transactions
Compressor units sold (compressor) | compressor_unit	11
Compressor units purchased (compressor) | compressor_unit	30
Horse power related to compressor units sold (horsepower) | hp	8,441
Horse power related to compressor units purchased (horsepower) | hp	10,089
Net book value of compressor units sold | $	$ 6,993
Net book value of compressor units purchased | $	$ 4,126

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 21, 2019	Dec. 31, 2018
Long-Term Debt
Long-term debt	$ 1,582,217		$ 1,529,501
Senior Notes
Long-Term Debt
Interest rate (as a percent)	6.00%
Senior Notes | 6.875% senior notes due April 2027
Long-Term Debt
Long-term debt, gross	$ 500,000		0
Less: Deferred financing costs, net of amortization	(9,111)		0
Long-term debt	$ 490,889		0
Interest rate (as a percent)	6.875%	6.875%
Senior Notes | 6% senior notes due April 2021
Long-Term Debt
Long-term debt, gross	$ 350,000		350,000
Less: Debt discount, net of amortization	(1,598)		(1,789)
Less: Deferred financing costs, net of amortization	(2,055)		(2,311)
Long-term debt	$ 346,347		345,900
Interest rate (as a percent)	6.00%
Senior Notes | 6% senior notes due October 2022
Long-Term Debt
Long-term debt, gross	$ 350,000		350,000
Less: Debt discount, net of amortization	(2,590)		(2,766)
Less: Deferred financing costs, net of amortization	(2,929)		(3,133)
Long-term debt	$ 344,481		344,101
Interest rate (as a percent)	6.00%
Revolving Credit Facility | Credit Facility
Long-Term Debt
Long-term debt	$ 400,500		$ 839,500

Long-Term Debt - Credit Facilit

Long-Term Debt - Credit Facility (Details) - Revolving Credit Facility - Credit Facility - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Long-Term Debt
Letters of credit outstanding	$ 15.2
Weighted average interest rate (percentage)	5.30%		5.40%
Commitment fees	$ 0.5	$ 0.5
Line of credit remaining borrowing capacity	834.3
Maximum
Long-Term Debt
Line of credit remaining borrowing capacity	$ 485.8
Base Rate
Long-Term Debt
Spread on variable rate	2.70%

Long-Term Debt - Debt Ratios (D

Long-Term Debt - Debt Ratios (Details) - Revolving Credit Facility	3 Months Ended	6 Months Ended	12 Months Ended		21 Months Ended
	Mar. 31, 2019	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 30, 2022
Line of Credit Facility
EBITDA to total interest expenses ratio	2.5
Senior secured debt to EBITDA ratio	3.5
Total debt to EBITDA ratio				5.95
Forecasted
Line of Credit Facility
Total debt to EBITDA ratio		5.5	5.75		5.25
Forecasted | Conditional Event
Line of Credit Facility
Total debt to EBITDA ratio					5.5

Long-Term Debt - Senior Notes (

Long-Term Debt - Senior Notes (Details) - USD ($)	Apr. 05, 2019	Mar. 21, 2019	Mar. 31, 2019	Mar. 31, 2018
Long-Term Debt
Proceeds from borrowings of long-term debt			$ 690,000,000	$ 73,830,000
Repayments of long-term debt			$ 629,000,000	$ 61,136,000
Senior Notes
Long-Term Debt
Interest rate (as a percent)			6.00%
Senior Notes | 6.875% senior notes due April 2027
Long-Term Debt
Debt instrument face amount		$ 500,000,000
Interest rate (as a percent)		6.875%	6.875%
Proceeds from borrowings of long-term debt		$ 490,900,000
Debt issuance cost		$ 9,100,000
Senior Notes | 6.875% senior notes due April 2027 | Prior to April 1, 2022
Long-Term Debt
Redemption rate (percent)			100.00%
Senior Notes | 6.875% senior notes due April 2027 | Prior to April 1, 2022 | Conditional Event One [Member]
Long-Term Debt
Redemption rate (percent)			106.875%
Maximum aggregate principal redemption prior to Apr.2022 (percentage)			35.00%
Minimum aggregate principal outstanding prior to Apr.2022 (percentage)			65.00%
Senior Notes | 6.875% senior notes due April 2027 | On or after April 1, 2022
Long-Term Debt
Redemption rate (percent)			105.156%
Senior Notes | 6.875% senior notes due April 2027 | On or after April 1, 2023
Long-Term Debt
Redemption rate (percent)			103.438%
Senior Notes | 6.875% senior notes due April 2027 | On or after April 1, 2024
Long-Term Debt
Redemption rate (percent)			101.719%
Senior Notes | 6.875% senior notes due April 2027 | Beginning on or after April 1, 2025 and any time after
Long-Term Debt
Redemption rate (percent)			100.00%
Senior Notes | 6% senior notes due April 2021
Long-Term Debt
Interest rate (as a percent)			6.00%
Senior Notes | 6% senior notes due April 2021 | Subsequent Events
Long-Term Debt
Interest rate (as a percent)	6.00%
Repayments of long-term debt	$ 350,000,000
Redemption rate (percent)	100.00%

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue
Contract revenue	$ 165,719	$ 147,002
Transferred at point in time
Disaggregation of Revenue
Contract revenue	2,100	1,100
0 - 1,000 horsepower per unit
Disaggregation of Revenue
Contract revenue	58,161	54,427
1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	68,207	60,694
Over 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	39,025	31,435
Other
Disaggregation of Revenue
Contract revenue	$ 326	$ 446

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Remaining Performance Obligation (Details) $ in Thousands	Mar. 31, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 261,315
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 162,137
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 77,913
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	$ 19,075
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]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 2,170
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]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 20
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	1 year

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Contract with Client (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Disaggregation of Revenue
Net receivables	$ 81,119		$ 80,606
Contract liability with customer	9,100		9,700
Deferred revenue recognized in earnings	4,768	$ 2,237
Contracts with customer
Disaggregation of Revenue
Net receivables	$ 78,700		$ 78,600

Derivatives - Interest Rate Ris

Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments $ in Millions	Mar. 31, 2019USD ($)
Interest rate swaps
Accounting for Derivatives
Notional amount of interest rate swaps	$ 500
May 2019
Accounting for Derivatives
Notional amount of interest rate swaps	100
May 2020
Accounting for Derivatives
Notional amount of interest rate swaps	100
March 2022
Accounting for Derivatives
Notional amount of interest rate swaps	$ 300

Derivatives - Interest Rate R_2

Derivatives - Interest Rate Risk (Narratives) (Details) - Derivatives designated as hedging instruments - Interest rate swaps $ in Millions	Mar. 31, 2019USD ($)
Accounting for Derivatives
Deferred gain to be reclassified during next 12 months	$ 2.4
Weighted average effective fixed interest rate on interest rate swaps (as a percent)	1.80%

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	Mar. 31, 2019	Dec. 31, 2018
Accounting for Derivatives
Derivative asset	$ 4,082	$ 7,307
Derivative asset
Accounting for Derivatives
Derivative asset	2,428	3,185
Other assets
Accounting for Derivatives
Derivative asset	$ 1,654	$ 4,122

Derivatives - Effect on Deriv_2

Derivatives - Effect on Derivative Instruments on the Income Statement (Details) - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Effect of derivative instruments on results of operations
Pre-tax gain (loss) recognized in other comprehensive income (loss)	$ (2,299)	$ 4,696
Interest expense, net
Effect of derivative instruments on results of operations
Pre-tax gain (loss) reclassified from accumulated other comprehensive income into interest expense, net	$ 926	$ (455)

Derivatives - Derivative Gain (

Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Effect of derivative instruments on results of operations
Interest expense, net	$ 23,428	$ 21,609
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Effect of derivative instruments on results of operations
Interest expense, net	$ (926)	$ 54

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Recurring basis | Level 2
Fair value measurements
Interest rate swaps asset	$ 4.1	$ 7.3

Fair Value Measurements (Narrat

Fair Value Measurements (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Nonrecurring basis | Level 3
Fair value measurements
Impaired long-lived assets	$ 0.3	$ 1
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	Mar. 31, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	$ 1,181,717	$ 690,001
Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	$ 1,216,000	$ 674,000

Long-Lived Asset Impairment (De

Long-Lived Asset Impairment (Details) hp in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)compressor_unithp	Mar. 31, 2018USD ($)compressor_unithp
Long-lived asset impairment
Impairment recorded on idle compressor units retired from the active fleet	$ 2,684	$ 3,066
Idle compressor units
Long-lived asset impairment
Idle compressor units retired from the active fleet (compressors) | compressor_unit	15	35
Horsepower of idle compressor units retired from the active fleet (horsepower) | hp	13	13
Impairment recorded on idle compressor units retired from the active fleet	$ 2,684	$ 3,066

Income Taxes (Narratives) (Deta

Income Taxes (Narratives) (Details) $ in Millions	Mar. 31, 2019USD ($)
Income Tax Disclosure [Abstract]
Potential decrease in unrecognized tax benefit	$ 1.2

Partners' Capital (Narratives)

Partners' Capital (Narratives) (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 26, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Partners' Equity, Allocations and Cash Distributions
Ownership interest held by public unitholders in the reporting entity (as a percent)			57.00%
Common units owned (in units)		70,231,036		70,231,036
General partner units, equivalent units outstanding (in units)		1,422,458		1,422,458
Distribution per common unit (in dollars per unit)		$ 0.240	$ 0.285
Subsequent Events
Partners' Equity, Allocations and Cash Distributions
Distribution per common unit (in dollars per unit)	$ 0.24
Authorized distributions to limited partnership, amount	$ 17.2
Archrock
Partners' Equity, Allocations and Cash Distributions
Common units owned (in units)			29,064,637
General partner units, equivalent units outstanding (in units)			1,422,458
Archrock | Archrock Partners, L.P
Partners' Equity, Allocations and Cash Distributions
General partner's ownership interest in partnership (as a percent)			43.00%
Senior Notes
Partners' Equity, Allocations and Cash Distributions
Interest rate (as a percent)		6.00%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Accrual for income tax liability	$ 3.2	$ 3.2

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	Apr. 05, 2019	Mar. 31, 2019	Mar. 31, 2018
Subsequent Event
Repayments of long-term debt		$ 629,000	$ 61,136
Senior Notes
Subsequent Event
Interest rate (as a percent)		6.00%
Senior Notes | 6% senior notes due April 2021
Subsequent Event
Interest rate (as a percent)		6.00%
Subsequent Events | Senior Notes | 6% senior notes due April 2021
Subsequent Event
Interest rate (as a percent)	6.00%
Redemption rate (percent)	100.00%
Repayments of long-term debt	$ 350,000
interest paid	200
Loss on the extinguishment of debt	$ 3,700

Uncategorized Items - a2019q110

Label	Element	Value
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 12,714,000
Accounting Standards Update 2014-09 [Member] | General Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	252,000
Accounting Standards Update 2014-09 [Member] | Limited Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	12,462,000
Accounting Standards Update 2017-12 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	383,000
Accounting Standards Update 2017-12 [Member] | General Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	8,000
Accounting Standards Update 2017-12 [Member] | Limited Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 375,000