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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 segment | Jun. 30, 2013
Reportable Segments |  |  |  |
Number of business segments |  |  | 4 |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 739,270 | $ 835,906 | $ 1,382,278 | $ 1,645,802
Gross margin | 255,974 | 255,869 | 489,460 | 480,611
North America Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 181,940 | 162,207 | 338,463 | 320,157
Gross margin | 104,426 | 91,694 | 189,868 | 178,534
International Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 134,392 | 117,872 | 245,432 | 227,430
Gross margin | 87,890 | 67,857 | 157,898 | 131,216
Aftermarket Services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 100,359 | 99,368 | 188,407 | 182,980
Gross margin | 21,062 | 21,432 | 41,289 | 39,598
Fabrication |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 322,579 | 456,459 | 609,976 | 915,235
Gross margin | $ 42,596 | $ 74,886 | $ 100,405 | $ 131,263

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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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