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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue and other financial information by reportable segment
Revenue	$ 874,970	$ 965,485	$ 904,441
Gross margin	497,777	509,247	440,074
Capital expenditures	140,302	385,198	319,102
Contract Operations
Revenue and other financial information by reportable segment
Revenue	738,918	771,539	672,536
Gross margin	477,831	474,279	399,523
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue	136,052	193,946	231,905
Gross margin	19,946	34,968	40,551
Operating Segments
Revenue and other financial information by reportable segment
Capital expenditures	138,800	383,364	313,159
Operating Segments | Contract Operations
Revenue and other financial information by reportable segment
Capital expenditures	133,492	374,650	307,048
Operating Segments | Aftermarket Services
Revenue and other financial information by reportable segment
Capital expenditures	5,308	8,714	6,111
Corporate
Revenue and other financial information by reportable segment
Capital expenditures	$ 1,502	$ 1,834	$ 5,943

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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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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