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Segments (Tables) | 9 Months Ended
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Sep. 30, 2021
Segment Reporting [Abstract] |
Summary of revenue and other financial information by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Contract |  | Aftermarket |  | ​ | ​
(in thousands) |  | Operations |  | Services |  | Total
Three months ended September 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Revenue | ​ | $ | 158,911 | ​ | $ | 36,255 | ​ | $ | 195,166
Gross margin | ​ |  | 97,631 | ​ |  | 5,603 | ​ |  | 103,234
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three months ended September 30, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 175,223 | ​ | $ | 30,408 | ​ | $ | 205,631
Gross margin | ​ |  | 114,779 | ​ |  | 4,699 | ​ |  | 119,478
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, 2021 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 488,810 | ​ | $ | 97,402 | ​ | $ | 586,212
Gross margin | ​ |  | 304,778 | ​ |  | 13,477 | ​ |  | 318,255
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 570,146 | ​ | $ | 105,498 | ​ | $ | 675,644
Gross margin | ​ |  | 367,661 | ​ |  | 16,112 | ​ |  | 383,773
Reconciliation of net income (loss) to gross margin | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total gross margin | ​ | $ | 103,234 | ​ | $ | 119,478 | ​ | $ | 318,255 | ​ | $ | 383,773
Less: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Selling, general and administrative | ​ |  | 28,839 | ​ |  | 18,681 | ​ |  | 80,000 | ​ |  | 78,052
Depreciation and amortization | ​ |  | 45,280 | ​ |  | 47,279 | ​ |  | 135,185 | ​ |  | 145,950
Long-lived and other asset impairment | ​ |  | 5,121 | ​ |  | 10,727 | ​ |  | 15,154 | ​ |  | 72,132
Goodwill impairment | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 99,830
Restructuring charges | ​ | ​ | 313 | ​ | ​ | 2,900 | ​ | ​ | 1,953 | ​ | ​ | 7,036
Interest expense | ​ |  | 25,508 | ​ |  | 25,221 | ​ |  | 82,711 | ​ |  | 80,664
Debt extinguishment loss | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 3,971
Gain on sale of assets, net | ​ | ​ | (15,393) | ​ | ​ | (9,146) | ​ | ​ | (29,549) | ​ | ​ | (11,073)
Other (income) expense, net | ​ |  | 337 | ​ |  | (324) | ​ |  | (1,634) | ​ |  | (1,317)
Income (loss) before income taxes | ​ | $ | 13,229 | ​ | $ | 24,140 | ​ | $ | 34,435 | ​ | $ | (91,472)

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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=123359005&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=123359005&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=123359005&loc=d3e8906-108599 + Details
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