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Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Disaggregation of Revenue
Number of reportable segments | segment			2
Contract revenue	$ 238,390	$ 226,870	$ 474,549	$ 438,910
Contract Operations | Transferred at point in time
Disaggregation of Revenue
Contract revenue	2,200	1,400	4,400	2,700
Contract Operations | Contract operations
Disaggregation of Revenue
Contract revenue	186,258	165,450	368,765	326,647
Contract Operations | 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Contract revenue	63,683	59,600	127,422	119,192
Contract Operations | 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	75,598	68,948	149,938	135,178
Contract Operations | Over 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	45,969	35,904	89,394	70,314
Contract Operations | Other
Disaggregation of Revenue
Contract revenue	1,008	998	2,011	1,963
Aftermarket Services | Aftermarket services
Disaggregation of Revenue
Contract revenue	52,132	61,420	105,784	112,263
Aftermarket Services | Services
Disaggregation of Revenue
Contract revenue	33,281	36,706	66,802	68,913
Aftermarket Services | OTC parts and components sales
Disaggregation of Revenue
Contract revenue	$ 18,851	$ 24,714	$ 38,982	$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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