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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2021
Valuation of our interest rate swaps and impaired assets |
Summary of assets and liabilities measured at fair value on recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | March 31, 2021 |  | December 31, 2020
Derivative liability | ​ | $ | 5,076 | ​ | $ | 6,337
Schedule of carrying value and estimated fair value of debt instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | March 31, 2021 |  | December 31, 2020
Carrying amount of fixed rate debt (1) | ​ | $ | 1,295,738 | ​ | $ | 1,295,867
Fair value of fixed rate debt | ​ |  | 1,337,000 | ​ |  | 1,371,000
(1) | Carrying amounts are shown net of unamortized debt premium and unamortized deferred financing costs. See Note 9 (“Long-Term Debt”).
Compressors |
Valuation of our interest rate swaps and impaired assets |
Schedule of non-recurring fair value assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | March 31, 2021 |  | December 31, 2020
Impaired compressors | ​ | $ | 3,318 | ​ | $ | 19,046
Schedule of additional quantitative information related to our significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​
​ |  | Range |  | Weighted Average (1)
Estimated net sale proceeds: | ​ | ​ | ​ | ​
As of March 31, 2021 | ​ | $0 - $289 per horsepower | ​ | $17 per horsepower
As of December 31, 2020 | ​ | $0 - $289 per horsepower | ​ | $20 per horsepower
(1) | Calculated based on an estimated discount for market liquidity of 79% and 81% as of March 31, 2021 and December 31, 2020, respectively.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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