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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue and other financial information by reportable segment |  |
Revenues | $ 212,040 | $ 189,885
Total gross margin | 105,108 | 92,056
Contract Operations |  |
Revenue and other financial information by reportable segment |  |
Revenues | 161,197 | 149,984
Total gross margin | 96,602 | 85,887
Aftermarket Services |  |
Revenue and other financial information by reportable segment |  |
Revenues | 50,843 | 39,901
Total gross margin | $ 8,506 | $ 6,169

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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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- Details
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- Details
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