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Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) hp	Sep. 30, 2019 USD ($) hp	Sep. 30, 2020 USD ($) hp segment	Sep. 30, 2019 USD ($) hp
Disaggregation of Revenue
Revenue	$ 205,631	$ 244,949	$ 675,644	$ 719,498
Number of reportable segments \| segment			2
Contract Operations
Disaggregation of Revenue
Revenue	175,223	198,337	$ 570,146	567,102
Contract Operations \| Transferred at Point in Time
Disaggregation of Revenue
Revenue	1,400	1,600	4,500	6,000
Contract Operations \| 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Revenue	$ 51,409	$ 66,026	$ 175,877	$ 193,448
Contract Operations \| 0 - 1,000 horsepower per unit \| Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	0	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	1,000
Contract Operations \| 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 73,205	$ 81,755	$ 236,083	$ 231,693
Contract Operations \| 1,001 - 1,500 horsepower per unit \| Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	1,001	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	1,500
Contract Operations \| Over 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 50,142	$ 49,572	$ 156,351	$ 138,966
Contract Operations \| Over 1,500 horsepower per unit \| Minimum
Disaggregation of Revenue
Compressor units horsepower (horsepower) \| hp	1,500	1,500	1,500	1,500
Contract Operations \| Other
Disaggregation of Revenue
Revenue	$ 467	$ 984	$ 1,835	$ 2,995
Aftermarket Services
Disaggregation of Revenue
Revenue	30,408	46,612	105,498	152,396
Aftermarket Services \| Services
Disaggregation of Revenue
Revenue	17,961	28,888	62,492	95,689
Reversal of revenue due to change in estimate of performance obligation partially satisfied in prior periods		700		700
Aftermarket Services \| OTC parts and components sales
Disaggregation of Revenue
Revenue	$ 12,447	$ 17,724	$ 43,006	$ 56,707