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Reportable Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($)
Reportable segments |  |  |  |
Number of reportable segments | segment |  |  | 4 |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 683,832 | $ 739,270 | $ 1,412,914 | $ 1,382,278
Gross margin | 246,841 | 255,974 | 515,853 | 489,460
North America contract operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 198,259 | 181,940 | 400,520 | 338,463
Gross margin | 117,038 | 104,426 | 236,620 | 189,868
International contract operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 115,250 | 134,392 | 235,941 | 245,432
Gross margin | 70,505 | 87,890 | 146,857 | 157,898
Aftermarket services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 90,834 | 100,359 | 177,690 | 188,407
Gross margin | 20,663 | 21,062 | 41,585 | 41,289
Fabrication |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 279,489 | 322,579 | 598,763 | 609,976
Gross margin | $ 38,635 | $ 42,596 | $ 90,791 | $ 100,405

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