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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2023
Fair value |
Schedule of carrying value and estimated fair value of debt instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | June 30, 2023 |  | December 31, 2022
Carrying amount of fixed rate debt (1) | ​ | $ | 1,297,464 | ​ | $ | 1,297,084
Fair value of fixed rate debt | ​ |  | 1,231,000 | ​ |  | 1,214,000
(1) Carrying amounts are shown net of unamortized premium and deferred financing costs. See Note 5 (“Long-Term Debt”).
Compressors |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​
​ |  | Range |  | Weighted Average (1)
Estimated net sale proceeds: | ​ | ​ | ​ | ​
As of June 30, 2023 | ​ | $0 - $310 per horsepower | ​ | $50 per horsepower
As of December 31, 2022 | ​ | $0 - $621 per horsepower | ​ | $47 per horsepower
(1) | Calculated based on an estimated discount for market liquidity of 38% and 51% as of June 30, 2023 and December 31, 2022, respectively.
Schedule of non-recurring fair value assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | ​ | ​ | June 30, 2023 | ​ | December 31, 2022
Impaired compressors | ​ | ​ | ​ | $ | 550 | ​ | $ | 1,961
Ecotec | Equity investment |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Significant Unobservable Inputs | ​ | ​ | Range | ​ | ​ | Median
Valuation technique: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discounted cash flow | ​ | WACC | ​ | 0% - 17.4% | ​ | ​ | 10.0%
Guideline public company | ​ | Revenue multiple | ​ | 1.6x - 10x | ​ | ​ | 4.0x
Schedule of changes in assets measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) | ​ | ​ | 2023 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2022
Balance at beginning of period |  | $ | 14,549 |  | $ | — | ​ | $ | 12,803 |  | $ | —
Purchases of equity interests | ​ | ​ | — | ​ | ​ | 8,000 | ​ | ​ | 2,000 | ​ | ​ | 8,000
Unrealized loss (1) | ​ | ​ | (1,742) | ​ | ​ | — | ​ | ​ | (1,996) | ​ | ​ | —
Balance at end of period | ​ | $ | 12,807 | ​ | $ | 8,000 | ​ | $ | 12,807 | ​ | $ | 8,000
(1) | Included in other expense (income) in our unaudited condensed consolidated statement of operations.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + 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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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