Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) hp segment	Dec. 31, 2019 USD ($) hp	Dec. 31, 2018 USD ($) hp
Disaggregation of Revenue
Revenue	$ 874,970	$ 965,485	$ 904,441
Number of reportable segments \| segment	2
Contract Operations
Disaggregation of Revenue
Revenue	$ 738,918	771,539	672,536
Contract Operations \| Transferred at Point in Time
Disaggregation of Revenue
Revenue	5,600	7,900	6,600
Contract Operations \| 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Revenue	$ 224,702	$ 259,985	$ 241,810
Contract Operations \| 0 - 1,000 horsepower per unit \| Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	0	0	0
Contract Operations \| 0 - 1,000 horsepower per unit \| Maximum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	1,000	1,000	1,000
Contract Operations \| 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 305,185	$ 316,082	$ 276,775
Contract Operations \| 1,001 - 1,500 horsepower per unit \| Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	1,001	1,001	1,001
Contract Operations \| 1,001 - 1,500 horsepower per unit \| Maximum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	1,500	1,500	1,500
Contract Operations \| Over 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 206,749	$ 191,510	$ 149,783
Contract Operations \| Over 1,500 horsepower per unit \| Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	1,500	1,500	1,500
Contract Operations \| Other
Disaggregation of Revenue
Revenue	$ 2,282	$ 3,962	$ 4,168
Aftermarket Services
Disaggregation of Revenue
Revenue	136,052	193,946	231,905
Aftermarket Services \| Services
Disaggregation of Revenue
Revenue	79,012	122,076	142,476
Reversal of revenue due to change in estimate of performance obligation partially satisfied in prior periods		900
Aftermarket Services \| OTC parts and components sales
Disaggregation of Revenue
Revenue	$ 57,040	$ 71,870	$ 89,429

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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