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.

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

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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.

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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue and other financial information by reportable segment
Revenue	$ 245,987	$ 244,949	$ 238,390	$ 236,159	$ 233,159	$ 232,372	$ 226,870	$ 212,040	$ 965,485	$ 904,441	$ 794,655
Gross margin									509,247	440,074	375,733
Capital expenditures									385,198	319,102	221,693
Contract Operations \| Contract operations
Revenue and other financial information by reportable segment
Revenue									771,539	672,536	610,921
Aftermarket Services \| Aftermarket Services
Revenue and other financial information by reportable segment
Revenue									193,946	231,905
Operating
Revenue and other financial information by reportable segment
Revenue									965,485	904,441	794,655
Gross margin									509,247	440,074	375,733
Capital expenditures									383,364	313,159	215,080
Operating \| Contract Operations
Revenue and other financial information by reportable segment
Revenue									771,539	672,536	610,921
Gross margin									474,279	399,523	347,916
Capital expenditures									374,650	307,048	211,651
Operating \| Aftermarket Services
Revenue and other financial information by reportable segment
Revenue									193,946	231,905	183,734
Gross margin									34,968	40,551	27,817
Capital expenditures									8,714	6,111	3,429
Other
Revenue and other financial information by reportable segment
Revenue									0	0	0
Gross margin									0	0	0
Capital expenditures									$ 1,834	$ 5,943	$ 6,613