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Revenue from Contract with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue
Contract revenue	$ 226,870	$ 197,982	$ 438,910	$ 387,867
Contract Operations | Transferred at point in time
Disaggregation of Revenue
Contract revenue	1,400		2,700
Contract Operations | Contract operations
Disaggregation of Revenue
Contract revenue	165,450	151,114	326,647	301,098
Contract Operations | 0 - 1000 horsepower per unit
Disaggregation of Revenue
Contract revenue	59,600		119,192
Contract Operations | 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	68,948		135,178
Contract Operations | Over 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	35,904		70,314
Contract Operations | Other
Disaggregation of Revenue
Contract revenue	998		1,963
Aftermarket Services | Aftermarket services
Disaggregation of Revenue
Contract revenue	61,420	$ 46,868	112,263	$ 86,769
Aftermarket Services | Services
Disaggregation of Revenue
Contract revenue	36,706		68,913
Aftermarket Services | OTC parts and components sales
Disaggregation of Revenue
Contract revenue	$ 24,714		$ 43,350

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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