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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2024
Fair value |
Schedule of carrying value and estimated fair value of debt instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | June 30, 2024 |  | December 31, 2023
Carrying amount of fixed rate debt (1) | ​ | $ | 1,298,256 | ​ | $ | 1,297,844
Fair value of fixed rate debt | ​ |  | 1,295,000 | ​ |  | 1,289,000
(1) Carrying amounts are shown net of unamortized premium and deferred financing costs. See Note 6 (“Long-Term Debt”).
Compressors |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​
​ |  | Range |  | Weighted Average (1)
Estimated net sale proceeds: | ​ | ​ | ​ | ​
As of June 30, 2024 | ​ | $0 - $211 per horsepower | ​ | $51 per horsepower
As of December 31, 2023 | ​ | $0 - $294 per horsepower | ​ | $50 per horsepower
(1) | Calculated based on an estimated discount for market liquidity of 26% and 33% as of June 30, 2024 and December 31, 2023, respectively.
Schedule of non-recurring fair value assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​ | June 30, 2024 | ​ | December 31, 2023
Impaired compressors | ​ | ​ | ​ | $ | 594 | ​ | $ | 1,423
ECOTEC | Equity investment |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Significant | ​ | Three Months Ended | ​ | Three Months Ended
​ | ​ | Unobservable | ​ | June 30, 2024 | ​ | June 30, 2023
​ | ​ | Inputs | ​ | Range | ​ | Median | ​ | Range | ​ | Median
Valuation technique: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discounted cash flow | ​ | WACC | ​ | 0.4% - 20.0% | ​ | ​ | 13.5% | ​ | 0.0% - 17.4% | ​ | ​ | 10.0%
Guideline public company | ​ | Revenue multiple | ​ | 1.5x - 7.2x | ​ | ​ | 3.8x | ​ | 1.6x - 10.0x | ​ | ​ | 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) | ​ | ​ | 2024 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​ | ​ | 2023
Balance at beginning of period |  | $ | 14,905 |  | $ | 14,549 | ​ | $ | 14,905 |  | $ | 12,803
Purchases of equity interests | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,000
Unrealized loss (1) | ​ | ​ | — | ​ | ​ | (1,742) | ​ | ​ | — | ​ | ​ | (1,996)
Balance at end of period | ​ | $ | 14,905 | ​ | $ | 12,807 | ​ | $ | 14,905 | ​ | $ | 12,807
(1) | Included in other expense, net in our unaudited condensed consolidated statement of operations.

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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://www.xbrl.org/2009/role/commonPracticeRef -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 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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