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Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Disaggregation of Revenue
Contract revenue	$ 249,697	$ 236,159
Number of reportable segments | segment	2
Contract Operations | Transferred at Point in Time
Disaggregation of Revenue
Contract revenue	$ 1,600	2,100
Contract Operations | Contract operations
Disaggregation of Revenue
Contract revenue	206,974	182,507
Contract Operations | 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Contract revenue	66,740	63,739
Contract Operations | 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	84,852	74,340
Contract Operations | Over 1,500 horsepower per unit
Disaggregation of Revenue
Contract revenue	54,591	43,425
Contract Operations | Other
Disaggregation of Revenue
Contract revenue	791	1,003
Aftermarket Services | Aftermarket services
Disaggregation of Revenue
Contract revenue	42,723	53,652
Aftermarket Services | Services
Disaggregation of Revenue
Contract revenue	25,450	33,521
Aftermarket Services | OTC parts and components sales
Disaggregation of Revenue
Contract revenue	$ 17,273	$ 20,131

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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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