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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair value

Schedule of changes in assets measured at fair value on a recurring basis

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​	​	​	​	​	​	​	​
​	​	​	Year Ended
​	​	​	December 31,
(in thousands)	​	​	​	2023	​	​	2022
Balance at beginning of period		​	$	12,803		$	—
Purchases of equity interests	​	​	​	3,075	​	​	14,667
Unrealized loss (1)	​	​	​	(973)	​	​	(1,864)
Balance at end of period	​	​	$	14,905	​	$	12,803

⁽¹⁾ Included in other expense (income) in our consolidated statements of operations.

Schedule of carrying value and estimated fair value of debt instruments

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​	​	​	​	​	​	​
​	​	December 31,
(in thousands)	​	2023		​	2022
Carrying amount of fixed rate debt (1)	​	$	1,297,844	​	$	1,297,084
Fair value of fixed rate debt	​		1,289,000	​		1,214,000

(1) Carrying amounts are shown net of unamortized debt premium and deferred financing costs. See Note 15 (“Long-Term Debt”).

Compressors

Fair value

Schedule of significant unobservable inputs

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​	​	​	​	​
​		Range		Weighted Average (1)
Estimated net sale proceeds:	​	​	​	​
As of December 31, 2023	​	$0 - $294 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 33% and 51% as of December 31, 2023 and 2022, respectively.

Schedule of non-recurring fair value assets

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​	​	​	​	​	​	​
​	​	December 31,
(in thousands)	​	2023		​	2022
Impaired compressors	​	$	1,423	​	$	1,961

Ionada

Fair value

Schedule of reconciliation of changes in the carrying value of investment measured at fair value on nonrecurring basis

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​	​	​	​
​	​	Year Ended
​	​	December 31,
(in thousands)	​	​	2023
Purchases of equity interests		$	3,808
Transaction costs capitalized as investment activity	​	​	397
Initial cost basis	​	​	4,205
Adjustments	​	​	—
Carrying value	​	$	4,205

ECOTEC | Equity investment

Fair value

Schedule of significant unobservable inputs

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Significant

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Year Ended

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Year Ended

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Unobservable

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December 31, 2023

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December 31, 2022

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Inputs

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Range

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Median

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Range

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Median

Valuation technique:

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Discounted cash flow

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WACC

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0.4% - 20.0%

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13.5%

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0.0% - 22.1%

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11.3%

Guideline public company

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Revenue multiple

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1.5x - 7.2x

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3.8x

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1.7x - 8.0x

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3.9x

X

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Tabular disclosure of investment in equity security without readily determinable fair value.

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