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Segments (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Revenue and other financial information by reportable segment | The following table presents revenue, gross margin and capital expenditures by segment during the years ended December 31, 2020, 2019 and 2018 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Contract |  | Aftermarket |  | Segments |  | ​ |  | ​ | ​
​ |  | Operations |  | Services |  | Total |  | Other (1) |  | Total
2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Revenue | ​ | $ | 738,918 | ​ | $ | 136,052 | ​ | $ | 874,970 | ​ | $ | — | ​ | $ | 874,970
Gross margin | ​ |  | 477,831 | ​ |  | 19,946 | ​ |  | 497,777 | ​ |  | — | ​ |  | 497,777
Capital expenditures | ​ | ​ | 133,492 | ​ |  | 5,308 | ​ |  | 138,800 | ​ |  | 1,502 | ​ |  | 140,302
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 771,539 | ​ | $ | 193,946 | ​ | $ | 965,485 | ​ | $ | — | ​ | $ | 965,485
Gross margin | ​ |  | 474,279 | ​ |  | 34,968 | ​ |  | 509,247 | ​ |  | — | ​ |  | 509,247
Capital expenditures | ​ |  | 374,650 | ​ |  | 8,714 | ​ |  | 383,364 | ​ |  | 1,834 | ​ |  | 385,198
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2018 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 672,536 | ​ | $ | 231,905 | ​ | $ | 904,441 | ​ | $ | — | ​ | $ | 904,441
Gross margin | ​ |  | 399,523 | ​ |  | 40,551 | ​ |  | 440,074 | ​ |  | — | ​ |  | 440,074
Capital expenditures | ​ |  | 307,048 | ​ |  | 6,111 | ​ |  | 313,159 | ​ |  | 5,943 | ​ |  | 319,102
(1) | Corporate-related items.
Schedule of assets by segment | ​ The following table presents assets by segment reconciled to total assets per the consolidated balance sheets (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ |  | 2020 | ​ | 2019
Contract operations | ​ | $ | 2,593,864 | ​ | $ | 2,915,724
Aftermarket services | ​ |  | 45,985 | ​ |  | 67,832
Segment assets | ​ | ​ | 2,639,849 | ​ | ​ | 2,983,556
Other assets (1) | ​ | ​ | 128,837 | ​ | ​ | 113,518
Assets associated with discontinued operations | ​ | ​ | 11,036 | ​ | ​ | 12,901
Total assets | ​ | $ | 2,779,722 | ​ | $ | 3,109,975
(1) | Corporate-related items.
Reconciliation of net income (loss) to gross margin | The following table reconciles total gross margin to income (loss) before income taxes (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2020 |  | 2019 |  | 2018
Total gross margin | ​ | $ | 497,777 | ​ | $ | 509,247 | ​ | $ | 440,074
Less: | ​ |  |  | ​ |  |  | ​ |  |
Selling, general and administrative | ​ |  | 105,100 | ​ |  | 117,727 | ​ |  | 101,563
Depreciation and amortization | ​ |  | 193,138 | ​ |  | 188,084 | ​ |  | 174,946
Long-lived and other asset impairment | ​ |  | 79,556 | ​ |  | 44,663 | ​ |  | 28,127
Goodwill impairment | ​ | ​ | 99,830 | ​ | ​ | — | ​ | ​ | —
Restatement and other charges | ​ |  | — | ​ |  | 445 | ​ |  | 19
Restructuring charges | ​ | ​ | 8,450 | ​ | ​ | — | ​ | ​ | —
Interest expense | ​ |  | 105,716 | ​ |  | 104,681 | ​ |  | 93,328
Debt extinguishment loss | ​ |  | 3,971 | ​ |  | 3,653 | ​ |  | 2,450
Transaction-related costs | ​ |  | — | ​ |  | 8,213 | ​ |  | 10,162
Gain on sale of assets, net | ​ | ​ | (10,643) | ​ | ​ | (16,016) | ​ | ​ | (5,674)
Other income, net | ​ |  | (1,359) | ​ |  | (661) | ​ |  | (157)
Income (loss) before income taxes | ​ | $ | (85,982) | ​ | $ | 58,458 | ​ | $ | 35,310

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details
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