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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue and other financial information by reportable segment |  |  |
Revenue | $ 874,970 | $ 965,485 | $ 904,441
Gross margin | 497,777 | 509,247 | 440,074
Capital expenditures | 140,302 | 385,198 | 319,102
Contract Operations |  |  |
Revenue and other financial information by reportable segment |  |  |
Revenue | 738,918 | 771,539 | 672,536
Gross margin | 477,831 | 474,279 | 399,523
Aftermarket Services |  |  |
Revenue and other financial information by reportable segment |  |  |
Revenue | 136,052 | 193,946 | 231,905
Gross margin | 19,946 | 34,968 | 40,551
Operating Segments |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | 138,800 | 383,364 | 313,159
Operating Segments | Contract Operations |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | 133,492 | 374,650 | 307,048
Operating Segments | Aftermarket Services |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | 5,308 | 8,714 | 6,111
Corporate |  |  |
Revenue and other financial information by reportable segment |  |  |
Capital expenditures | $ 1,502 | $ 1,834 | $ 5,943

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