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Reportable Segments - Revenue and Gross Margin by Reportable Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Reportable segments
Number of reportable segments | segment			4
Revenue and other financial information by reportable segment
Revenue from external customers	$ 649,501	$ 723,832	$ 2,062,415	$ 2,106,110
Gross margin	239,762	266,485	755,615	755,945
North America Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	191,692	191,000	592,212	529,463
Gross margin	113,765	108,547	350,385	298,415
International Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	114,104	124,355	350,045	369,787
Gross margin	72,990	76,372	219,847	234,270
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	82,443	96,005	260,133	284,412
Gross margin	18,670	20,495	60,255	61,784
Fabrication
Revenue and other financial information by reportable segment
Revenue from external customers	261,262	312,472	860,025	922,448
Gross margin	$ 34,337	$ 61,071	$ 125,128	$ 161,476

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.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 1



-Article 5

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