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Reportable Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | $ 197,853 | $ 195,849 | $ 585,720 | $ 613,289
Total gross margin | 87,416 | 103,323 | 275,602 | 329,003
Contract Operations |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 153,524 | 156,599 | 454,622 | 495,811
Total gross margin | 81,573 | 96,823 | 256,331 | 308,990
Aftermarket Services |  |  |  |
Revenue and other financial information by reportable segment |  |  |  |
Revenue from external customers | 44,329 | 39,250 | 131,098 | 117,478
Total gross margin | $ 5,843 | $ 6,500 | $ 19,271 | $ 20,013

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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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