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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 segment | Sep. 30, 2013
Reportable Segments |  |  |  |
Number of business segments |  |  | 4 |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 723,832 | $ 775,584 | $ 2,106,110 | $ 2,421,386
Gross margin | 266,485 | 244,931 | 755,945 | 725,542
North America Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 191,000 | 152,627 | 529,463 | 472,784
Gross margin | 108,547 | 81,750 | 298,415 | 260,284
International Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 124,355 | 117,545 | 369,787 | 344,975
Gross margin | 76,372 | 66,947 | 234,270 | 198,163
Aftermarket Services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 96,005 | 102,157 | 284,412 | 285,137
Gross margin | 20,495 | 21,369 | 61,784 | 60,967
Fabrication |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 312,472 | 403,255 | 922,448 | 1,318,490
Gross margin | $ 61,071 | $ 74,865 | $ 161,476 | $ 206,128

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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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