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Revenue From Contracts with Customers - Disaggregate of Revenue (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disaggregation of Revenue
Revenue	$ 233,159	$ 232,372	$ 226,870	$ 212,040	$ 208,935	$ 197,853	$ 197,982	$ 189,885	$ 904,441	$ 794,655	$ 807,069
Number of reportable segments | segment									2
Contract Operations | Transferred at Point in Time
Disaggregation of Revenue
Revenue									$ 6,600
Contract Operations | Contract operations
Disaggregation of Revenue
Revenue									672,536	610,921	647,828
Contract Operations | 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Revenue									241,810
Contract Operations | 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Revenue									276,775
Contract Operations | Over 1,500 horsepower per unit
Disaggregation of Revenue
Revenue									149,783
Contract Operations | Other
Disaggregation of Revenue
Revenue									4,168
Aftermarket Services | Aftermarket services
Disaggregation of Revenue
Revenue									231,905	$ 183,734	$ 159,241
Aftermarket Services | Services
Disaggregation of Revenue
Revenue									142,476
Aftermarket Services | OTC parts and components sales
Disaggregation of Revenue
Revenue									$ 89,429

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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