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Segments (Tables) | 3 Months Ended
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Mar. 31, 2020
Segment Reporting [Abstract] |
Revenue and other financial information by reportable segment | The following table presents revenue and gross margin by segment during the three months ended March 31, 2020 and 2019 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Contract |  | Aftermarket |  | ​ | ​
​ |  | Operations |  | Services |  | Total
Three months ended March 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Revenue | ​ | $ | 206,974 | ​ | $ | 42,723 | ​ | $ | 249,697
Gross margin | ​ |  | 128,323 | ​ |  | 7,732 | ​ |  | 136,055
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three months ended March 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 182,507 | ​ | $ | 53,652 | ​ | $ | 236,159
Gross margin | ​ |  | 107,772 | ​ |  | 9,750 | ​ |  | 117,522
Reconciliation of net income (loss) to gross margin | The following table reconciles total gross margin to income (loss) before income taxes (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended
​ | ​ | March 31,
​ |  | 2020 |  | 2019
Total gross margin | ​ | $ | 136,055 | ​ | $ | 117,522
Less: | ​ |  |  | ​ |  |
Selling, general and administrative | ​ |  | 30,626 | ​ |  | 28,989
Depreciation and amortization | ​ |  | 49,822 | ​ |  | 44,106
Long-lived asset impairment | ​ |  | 6,195 | ​ |  | 3,092
Goodwill impairment | ​ | ​ | 99,830 | ​ | ​ | —
Restatement and other charges | ​ |  | — | ​ |  | 421
Restructuring charges | ​ | ​ | 1,728 | ​ | ​ | —
Interest expense | ​ |  | 29,665 | ​ |  | 23,617
Transaction-related costs | ​ |  | — | ​ |  | 180
(Gain) loss on sale of assets, net | ​ | ​ | (4,116) | ​ | ​ | 16
Other income, net | ​ |  | (555) | ​ |  | (221)
Income (loss) before income taxes | ​ | $ | (77,140) | ​ | $ | 17,322

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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=115929826&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=115929826&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=108376223&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 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: 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=115929826&loc=d3e8906-108599 + Details
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