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Reportable Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 204,145 | $ 255,062 | $ 417,440 | $ 507,935
Income (loss) before income taxes | 110,926 | 127,997 | 225,680 | 257,414
Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 162,973 | 198,259 | 339,212 | 400,520
Aftermarket Services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 41,172 | 56,803 | 78,228 | 107,415
Operating Segments | Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 162,973 | 198,259 | 339,212 | 400,520
Income (loss) before income taxes | 104,107 | 117,038 | 212,167 | 236,620
Operating Segments | Aftermarket Services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 41,172 | 56,803 | 78,228 | 107,415
Income (loss) before income taxes | $ 6,819 | $ 10,959 | $ 13,513 | $ 20,794

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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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