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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue and other financial information by reportable segment |  |  |
Revenue | $ 781,461 | $ 874,970 | $ 965,485
Gross margin | 422,544 | 497,777 | 509,247
Capital expenditures | 97,885 | 140,302 | 385,198
Contract Operations |  |  |
Revenue and other financial information by reportable segment |  |  |
Revenue | 648,311 | 738,918 | 771,539
Gross margin | 403,825 | 477,831 | 474,279
Aftermarket Services |  |  |
Revenue and other financial information by reportable segment |  |  |
Revenue | 133,150 | 136,052 | 193,946
Gross margin | 18,719 | 19,946 | 34,968
Operating | Contract Operations |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | 94,863 | 133,492 | 374,650
Operating | Aftermarket Services |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | 2,675 | 5,308 | 8,714
Corporate |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | $ 347 | $ 1,502 | $ 1,834

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