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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue and other financial information by reportable segment
Revenues	$ 249,697	$ 236,159
Gross margin	136,055	117,522
Contract Operations
Revenue and other financial information by reportable segment
Gross margin	128,323	107,772
Contract Operations | Contract operations
Revenue and other financial information by reportable segment
Revenues	206,974	182,507
Aftermarket Services
Revenue and other financial information by reportable segment
Gross margin	7,732	9,750
Aftermarket Services | Aftermarket services
Revenue and other financial information by reportable segment
Revenues	$ 42,723	$ 53,652

X

- 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.

+ Details

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X

- 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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- References

No definition available.

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- Details

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