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SEGMENT INFORMATION (Tables) | 9 Months Ended
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Sep. 30, 2022
SEGMENT INFORMATION |
Summary of revenue and other financial information by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Contract |  | Aftermarket |  | ​ | ​
​ |  | Operations |  | Services |  | Total
Three months ended September 30, 2022 |  | ​ |  |  | ​ |  |  | ​ |
Revenue | ​ | $ | 170,497 | ​ | $ | 43,171 | ​ | $ | 213,668
Gross margin | ​ |  | 98,803 | ​ |  | 7,338 | ​ |  | 106,141
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three months ended September 30, 2021 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 158,911 | ​ | $ | 36,255 | ​ | $ | 195,166
Gross margin | ​ |  | 97,631 | ​ |  | 5,603 | ​ |  | 103,234
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, 2022 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 500,451 | ​ | $ | 126,246 | ​ | $ | 626,697
Gross margin | ​ |  | 295,901 | ​ |  | 20,065 | ​ |  | 315,966
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, 2021 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 488,810 | ​ | $ | 97,402 | ​ | $ | 586,212
Gross margin | ​ |  | 304,778 | ​ |  | 13,477 | ​ |  | 318,255
Reconciliation of total gross margin to income before taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
Total gross margin | ​ | $ | 106,141 | ​ | $ | 103,234 | ​ | $ | 315,966 | ​ | $ | 318,255
Less: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Selling, general and administrative | ​ |  | 30,500 | ​ |  | 28,839 | ​ |  | 85,964 | ​ |  | 80,000
Depreciation and amortization | ​ |  | 39,953 | ​ |  | 45,280 | ​ |  | 124,348 | ​ |  | 135,185
Long-lived and other asset impairment | ​ |  | 4,154 | ​ |  | 5,121 | ​ |  | 16,217 | ​ |  | 15,154
Restructuring charges | ​ | ​ | — | ​ | ​ | 313 | ​ | ​ | — | ​ | ​ | 1,953
Interest expense | ​ |  | 25,177 | ​ |  | 25,508 | ​ |  | 74,879 | ​ |  | 82,711
Gain on sale of assets, net | ​ | ​ | (12,695) | ​ | ​ | (15,393) | ​ | ​ | (33,755) | ​ | ​ | (29,549)
Other (income) expense, net | ​ |  | (585) | ​ |  | 337 | ​ |  | (52) | ​ |  | (1,634)
Income before income taxes | ​ | $ | 19,637 | ​ | $ | 13,229 | ​ | $ | 48,365 | ​ | $ | 34,435

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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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://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 https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 + Details
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