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Segments (Tables) | 12 Months Ended
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Dec. 31, 2021
Segments |
Summary of revenue and other financial information by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Contract |  | Aftermarket |  | ​ |  | ​ | ​
(in thousands) |  | Operations |  | Services |  | Other (1) |  | Total
2021 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Revenue | ​ | $ | 648,311 | ​ | $ | 133,150 | ​ | $ | — | ​ | $ | 781,461
Gross margin | ​ |  | 403,825 | ​ |  | 18,719 | ​ |  | — | ​ |  | 422,544
Capital expenditures | ​ | ​ | 94,863 | ​ |  | 2,675 | ​ |  | 347 | ​ |  | 97,885
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 738,918 | ​ | $ | 136,052 | ​ | $ | — | ​ | $ | 874,970
Gross margin | ​ |  | 477,831 | ​ |  | 19,946 | ​ |  | — | ​ |  | 497,777
Capital expenditures | ​ |  | 133,492 | ​ |  | 5,308 | ​ |  | 1,502 | ​ |  | 140,302
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 771,539 | ​ | $ | 193,946 | ​ | $ | — | ​ | $ | 965,485
Gross margin | ​ |  | 474,279 | ​ |  | 34,968 | ​ |  | — | ​ |  | 509,247
Capital expenditures | ​ |  | 374,650 | ​ |  | 8,714 | ​ |  | 1,834 | ​ |  | 385,198
(1) | Corporate-related items.
Schedule of assets by segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
(in thousands) |  | 2021 | ​ | 2020
Contract operations assets | ​ | $ | 2,429,805 | ​ | $ | 2,593,864
Aftermarket services assets | ​ |  | 49,420 | ​ |  | 45,985
Segment assets | ​ | ​ | 2,479,225 | ​ | ​ | 2,639,849
Other assets (1) | ​ | ​ | 100,930 | ​ | ​ | 128,837
Assets associated with discontinued operations | ​ | ​ | 9,811 | ​ | ​ | 11,036
Total assets | ​ | $ | 2,589,966 | ​ | $ | 2,779,722
(1) | Corporate-related items.
Reconciliation of net income (loss) to gross margin | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2021 |  | 2020 |  | 2019
Total gross margin | ​ | $ | 422,544 | ​ | $ | 497,777 | ​ | $ | 509,247
Less: | ​ |  |  | ​ |  |  | ​ |  |
Selling, general and administrative | ​ |  | 107,167 | ​ |  | 105,100 | ​ |  | 117,727
Depreciation and amortization | ​ |  | 178,946 | ​ |  | 193,138 | ​ |  | 188,084
Long-lived and other asset impairment | ​ |  | 21,397 | ​ |  | 79,556 | ​ |  | 44,663
Goodwill impairment | ​ | ​ | — | ​ | ​ | 99,830 | ​ | ​ | —
Restatement and other charges | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 445
Restructuring charges | ​ | ​ | 2,903 | ​ | ​ | 8,450 | ​ | ​ | —
Interest expense | ​ |  | 108,135 | ​ |  | 105,716 | ​ |  | 104,681
Debt extinguishment loss | ​ |  | — | ​ |  | 3,971 | ​ |  | 3,653
Transaction-related costs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8,213
Gain on sale of assets, net | ​ | ​ | (30,258) | ​ | ​ | (10,643) | ​ | ​ | (16,016)
Other income, net | ​ |  | (4,707) | ​ |  | (1,359) | ​ |  | (661)
Income (loss) before income taxes | ​ | $ | 38,961 | ​ | $ | (85,982) | ​ | $ | 58,458

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