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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, 2019 | Mar. 31, 2018
Revenue and other financial information by reportable segment |  |
Revenues | $ 236,159 | $ 212,040
Total gross margin | 117,522 | 105,108
Contract Operations |  |
Revenue and other financial information by reportable segment |  |
Total gross margin | 107,772 | 96,602
Contract Operations | Contract operations |  |
Revenue and other financial information by reportable segment |  |
Revenues | 182,507 | 161,197
Aftermarket Services |  |
Revenue and other financial information by reportable segment |  |
Total gross margin | 9,750 | 8,506
Aftermarket Services | Aftermarket services |  |
Revenue and other financial information by reportable segment |  |
Revenues | $ 53,652 | $ 50,843

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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