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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2025
Fair value |
Schedule of carrying value and estimated fair value of debt instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | March 31, 2025 |  | December 31, 2024
Carrying amount of fixed rate debt (1) | ​ | $ | 1,790,442 | ​ | $ | 1,790,051
Fair value of fixed rate debt | ​ |  | 1,803,000 | ​ |  | 1,796,000
(1) Carrying amounts are shown net of unamortized premium and deferred financing costs. See Note 7 (“Long-Term Debt”).
Compressors |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​
​ |  | Range |  | Weighted Average (1)
Estimated net sale proceeds: | ​ | ​ | ​ | ​
As of March 31, 2025 | ​ | $0 - $241 per horsepower | ​ | $47 per horsepower
As of December 31, 2024 | ​ | $0 - $188 per horsepower | ​ | $46 per horsepower
(1) | Calculated based on an estimated discount for market liquidity of 25% as of both March 31, 2025 and December 31, 2024.
Schedule of non-recurring fair value assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​ | March 31, 2025 | ​ | December 31, 2024
Impaired compression fleet | ​ | ​ | ​ | $ | 119 | ​ | $ | 1,048
ECOTEC | Equity investment |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Significant | ​ | Three Months Ended | ​ | Three Months Ended
​ | ​ | Unobservable | ​ | March 31, 2025 | ​ | March 31, 2024
​ | ​ | Inputs | ​ | Range | ​ | Median | ​ | Range | ​ | Median
Valuation technique: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discounted cash flow | ​ | WACC | ​ | 0.0% - 17.0% | ​ | ​ | 12.9% | ​ | 0.4% - 20.0% | ​ | ​ | 13.5%
Guideline public company | ​ | Revenue multiple | ​ | 1.6x - 7.3x | ​ | ​ | 7.3x | ​ | 1.5x - 7.2x | ​ | ​ | 3.8x

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