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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue and other financial information by reportable segment
Revenues	$ 238,390	$ 226,870	$ 474,549	$ 438,910
Total gross margin	125,654	108,268	243,176	213,376
Contract Operations
Revenue and other financial information by reportable segment
Total gross margin	115,737	97,641	223,509	194,243
Contract Operations | Contract operations
Revenue and other financial information by reportable segment
Revenues	186,258	165,450	368,765	326,647
Aftermarket Services
Revenue and other financial information by reportable segment
Total gross margin	9,917	10,627	19,667	19,133
Aftermarket Services | Aftermarket services
Revenue and other financial information by reportable segment
Revenues	$ 52,132	$ 61,420	$ 105,784	$ 112,263

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

+ References

No definition available.

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- Definition

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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