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Segments (Tables) | 9 Months Ended
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Sep. 30, 2018
Segment Reporting [Abstract] |
Revenue and other financial information by reportable segment | The following table presents revenue and gross margin by segment during the three and nine months ended September 30, 2018 and 2017 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Total
Three months ended September 30, 2018 |  |  |  |  |
Revenue | $ | 169,509 |  |  | $ | 62,863 |  |  | $ | 232,372 |
Gross margin | 100,453 |  |  | 12,820 |  |  | 113,273 |
Three months ended September 30, 2017 |  |  |  |  |
Revenue | $ | 153,524 |  |  | $ | 44,329 |  |  | $ | 197,853 |
Gross margin | 81,573 |  |  | 5,843 |  |  | 87,416 |
Nine months ended September 30, 2018 |  |  |  |  |
Revenue | $ | 496,156 |  |  | $ | 175,126 |  |  | $ | 671,282 |
Gross margin | 294,696 |  |  | 31,953 |  |  | 326,649 |
Nine months ended September 30, 2017 |  |  |  |  |
Revenue | $ | 454,622 |  |  | $ | 131,098 |  |  | $ | 585,720 |
Gross margin | 256,331 |  |  | 19,271 |  |  | 275,602 |
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 September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Total gross margin | $ | 113,273 |  |  | $ | 87,416 |  |  | $ | 326,649 |  |  | $ | 275,602 |
Less: |  |  |  |  |  |  |
Selling, general and administrative | 26,298 |  |  | 29,108 |  |  | 80,455 |  |  | 81,823 |
Depreciation and amortization | 43,779 |  |  | 47,463 |  |  | 131,565 |  |  | 142,483 |
Long-lived asset impairment | 6,660 |  |  | 7,105 |  |  | 18,323 |  |  | 20,858 |
Restatement and other charges | 396 |  |  | 566 |  |  | (195 | ) |  | 3,287 |
Restructuring and other charges | — |  |  | 422 |  |  | — |  |  | 1,245 |
Interest expense | 23,518 |  |  | 22,892 |  |  | 69,402 |  |  | 66,817 |
Debt extinguishment loss | — |  |  | — |  |  | 2,450 |  |  | 291 |
Merger-related costs | 182 |  |  | — |  |  | 9,993 |  |  | — |
Other income, net | (660 | ) |  | (2,716 | ) |  | (3,449 | ) |  | (4,472 | )
Income (loss) before income taxes | $ | 13,100 |  |  | $ | (17,424 | ) |  | $ | 18,105 |  |  | $ | (36,730 | )

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- Definition Tabular disclosure of revenue, gross margin, assets, and capital expenditures by reportable segment reconciled to the entity's corresponding consolidated amount. + References No definition available. + Details
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- Definition Reconciliation of net income (loss) to gross margin. + References No definition available. + Details
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