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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair value |
Schedule of changes in assets measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | 2025 | ​ | 2024
Balance at beginning of period | ​ | $ | 14,671 | ​ | $ | 14,905
Purchases of equity interests | ​ | ​ | — | ​ | ​ | 1,250
Unrealized loss (1) | ​ | ​ | (25) | ​ | ​ | (1,484)
Balance at end of period | ​ | ​ | 14,646 | ​ | ​ | 14,671
(1) | Included in other expense, net in our consolidated statement of operations.
Schedule of carrying value and estimated fair value of debt instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) | ​ | 2025 | ​ | 2024
Carrying amount of fixed rate debt (1) | ​ | $ | 1,500,000 | ​ | $ | 1,800,000
Fair value of fixed rate debt | ​ |  | 1,527,000 | ​ |  | 1,796,000
(1) | Carrying amounts exclude unamortized debt premium and deferred financing costs. See Note 15 (“Long-Term Debt”) for further details.
Compressors |
Fair value |
Schedule of non-recurring fair value assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | 2025 | ​ | 2024
Impaired compression fleet | ​ | $ | 871 | ​ | $ | 1,048
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | Range | ​ ​ ​ ​ ​ ​ | ​ ​Weighted Average (1)
Estimated net sale proceeds: | ​ | ​ | ​ | ​
As of December 31, 2025 | ​ | $0 - $241 per horsepower | ​ | $54 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 19% and 25% as of December 31, 2025 and 2024, respectively. ​
ECOTEC | Equity investment |
Fair value |
Schedule of significant unobservable inputs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Significant | ​ | Year Ended | ​ | Year Ended
​ | ​ | Unobservable | ​ | December 31, 2025 | ​ | December 31, 2024
​ | ​ | Inputs | ​ | Range | ​ | Median | ​ | Range | ​ | Median
Valuation technique: | ​ ​ ​ ​ ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discounted cash flow | ​ | WACC | ​ | 0.0% - 17.8% | ​ | ​ | 11.1% | ​ | 0.0% - 17.0% | ​ | ​ | 12.9%
Guideline public company | ​ | Revenue multiple | ​ | 1.6x - 7.6x | ​ | ​ | 5.3x | ​ | 1.6x - 7.3x | ​ | ​ | 4.3x

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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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