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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

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