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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 segment | Sep. 30, 2012
Reportable Segments |  |  |  |
Number of business segments |  |  | 4 |
Sales and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 776,003 | $ 718,704 | $ 2,424,724 | $ 1,964,680
Gross margin | 244,781 | 210,680 | 726,720 | 594,797
North America Contract Operations |  |  |  |
Sales and other financial information by reportable segment |  |  |  |
Revenue from external customers | 153,046 | 151,532 | 476,122 | 450,684
Gross margin | 81,600 | 76,315 | 261,462 | 230,808
International Contract Operations |  |  |  |
Sales and other financial information by reportable segment |  |  |  |
Revenue from external customers | 117,545 | 110,632 | 344,975 | 336,046
Gross margin | 66,947 | 64,372 | 198,163 | 198,805
Aftermarket Services |  |  |  |
Sales and other financial information by reportable segment |  |  |  |
Revenue from external customers | 102,157 | 95,854 | 285,137 | 287,401
Gross margin | 21,369 | 20,061 | 60,967 | 62,349
Fabrication |  |  |  |
Sales and other financial information by reportable segment |  |  |  |
Revenue from external customers | 403,255 | 360,686 | 1,318,490 | 890,549
Gross margin | $ 74,865 | $ 49,932 | $ 206,128 | $ 102,835

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- 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 No definition available. + Details
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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 + Details
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