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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue and other financial information by reportable segment
Revenue	$ 233,159	$ 232,372	$ 226,870	$ 212,040	$ 208,935	$ 197,853	$ 197,982	$ 189,885	$ 904,441	$ 794,655	$ 807,069
Gross margin									440,074	375,733	427,150
Capital expenditures									319,102	221,693	117,572
Contract Operations | Contract operations
Revenue and other financial information by reportable segment
Revenue									672,536	610,921	647,828
Aftermarket Services | Aftermarket services
Revenue and other financial information by reportable segment
Revenue									231,905	183,734	159,241
Operating
Revenue and other financial information by reportable segment
Revenue										794,655	807,069
Gross margin										375,733	427,150
Capital expenditures									313,159	215,080	112,293
Operating | Contract Operations
Revenue and other financial information by reportable segment
Gross margin									399,523	347,916	400,788
Capital expenditures									307,048	211,651	111,170
Operating | Contract Operations | Contract operations
Revenue and other financial information by reportable segment
Revenue										610,921	647,828
Operating | Aftermarket Services
Revenue and other financial information by reportable segment
Gross margin									40,551	27,817	26,362
Capital expenditures									6,111	3,429	1,123
Operating | Aftermarket Services | Aftermarket services
Revenue and other financial information by reportable segment
Revenue										183,734	159,241
Other
Revenue and other financial information by reportable segment
Revenue									0	0	0
Gross margin									0	0	0
Capital expenditures									$ 5,943	$ 6,613	$ 5,279

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

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Name Accounting Standards Codification
-Topic 606
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