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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair value

Summary of assets and liabilities measured at fair value on recurring basis

​

​	​	​	​	​	​	​
(in thousands)		September 30, 2021			December 31, 2020
Derivative liabilities	​	$	2,581	​	$	6,337

Compressors

Fair value

Schedule of non-recurring fair value assets

​

​	​	​	​	​	​	​
(in thousands)		September 30, 2021			December 31, 2020
Impaired compressors	​	$	3,896	​	$	19,046

Schedule of significant unobservable inputs

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​	​	​	​	​
​		Range		Weighted Average (1)
Estimated net sale proceeds:	​	​	​	​
As of September 30, 2021	​	$0 - $621 per horsepower	​	$31 per horsepower
As of December 31, 2020	​	$0 - $289 per horsepower	​	$20 per horsepower

(1) Calculated based on an estimated discount for market liquidity of 68% and 81% as of September 30, 2021 and December 31, 2020, respectively.

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Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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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).

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