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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 197,982 | $ 204,145 | $ 387,867 | $ 417,440
Loss before income taxes | 96,130 | 110,926 | 188,186 | 225,680
Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 151,114 | 162,973 | 301,098 | 339,212
Loss before income taxes | 88,871 | 104,107 | 174,758 | 212,167
Aftermarket Services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 46,868 | 41,172 | 86,769 | 78,228
Loss before income taxes | $ 7,259 | $ 6,819 | $ 13,428 | $ 13,513

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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=63488584&loc=d3e20235-122688 + Details
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