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Segments (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Revenue and other financial information by reportable segment | The following table presents revenue and other financial information by segment during the three months ended March 31, 2018 and 2017 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Segments Total
Three months ended March 31, 2018: |  |  |  |  |
Revenue | $ | 161,197 |  |  | $ | 50,843 |  |  | $ | 212,040 |
Gross margin | 96,602 |  |  | 8,506 |  |  | 105,108 |
Three months ended March 31, 2017: |  |  |  |  |
Revenue | $ | 149,984 |  |  | $ | 39,901 |  |  | $ | 189,885 |
Gross margin | 85,887 |  |  | 6,169 |  |  | 92,056 |
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,
| 2018 |  | 2017
Total gross margin | $ | 105,108 |  |  | $ | 92,056 |
Less: |  |  |
Selling, general and administrative | 27,508 |  |  | 27,553 |
Depreciation and amortization | 44,455 |  |  | 47,772 |
Long-lived asset impairment | 4,710 |  |  | 8,245 |
Restatement and other charges | 485 |  |  | 801 |
Restructuring and other charges | — |  |  | 457 |
Interest expense | 22,547 |  |  | 21,421 |
Debt extinguishment costs | — |  |  | 291 |
Merger-related costs | 4,125 |  |  | — |
Other income, net | (1,145 | ) |  | (794 | )
Income (loss) before income taxes | $ | 2,423 |  |  | $ | (13,690 | )

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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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