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Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Disaggregation of Revenue |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Contract revenue | $ 232,372 | $ 197,853 | $ 671,282 | $ 585,720
Contract Operations | Transferred at point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 1,600 |  | 4,300 |
Contract Operations | Contract operations |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 169,509 | 153,524 | 496,156 | 454,622
Contract Operations | 0 - 1000 horsepower per unit |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 60,725 |  | 179,917 |
Contract Operations | 1,001 - 1,500 horsepower per unit |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 69,663 |  | 204,841 |
Contract Operations | Over 1,500 horsepower per unit |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 38,053 |  | 108,367 |
Contract Operations | Other |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 1,068 |  | 3,031 |
Aftermarket Services | Aftermarket services |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 62,863 | $ 44,329 | 175,126 | $ 131,098
Aftermarket Services | Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | 38,863 |  | 107,776 |
Aftermarket Services | OTC parts and components sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Contract revenue | $ 24,000 |  | $ 67,350 |

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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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