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Reportable Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue and other financial information by reportable segment
Revenue from external customers	$ 204,145	$ 255,062	$ 417,440	$ 507,935
Income (loss) before income taxes	110,926	127,997	225,680	257,414
Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	162,973	198,259	339,212	400,520
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	41,172	56,803	78,228	107,415
Operating Segments | Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	162,973	198,259	339,212	400,520
Income (loss) before income taxes	104,107	117,038	212,167	236,620
Operating Segments | Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	41,172	56,803	78,228	107,415
Income (loss) before income taxes	$ 6,819	$ 10,959	$ 13,513	$ 20,794

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

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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