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Segments (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2018 and 2017 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Total
Three months ended June 30, 2018 |  |  |  |  |
Revenue | $ | 165,450 |  |  | $ | 61,420 |  |  | $ | 226,870 |
Gross margin | 97,641 |  |  | 10,627 |  |  | 108,268 |
Three months ended June 30, 2017 |  |  |  |  |
Revenue | $ | 151,114 |  |  | $ | 46,868 |  |  | $ | 197,982 |
Gross margin | 88,871 |  |  | 7,259 |  |  | 96,130 |
Six months ended June 30, 2018 |  |  |  |  |
Revenue | $ | 326,647 |  |  | $ | 112,263 |  |  | $ | 438,910 |
Gross margin | 194,243 |  |  | 19,133 |  |  | 213,376 |
Six months ended June 30, 2017 |  |  |  |  |
Revenue | $ | 301,098 |  |  | $ | 86,769 |  |  | $ | 387,867 |
Gross margin | 174,758 |  |  | 13,428 |  |  | 188,186 |
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 June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Total gross margin | $ | 108,268 |  |  | $ | 96,130 |  |  | $ | 213,376 |  |  | $ | 188,186 |
Less: |  |  |  |  |  |  |
Selling, general and administrative | 26,649 |  |  | 25,162 |  |  | 54,157 |  |  | 52,715 |
Depreciation and amortization | 43,331 |  |  | 47,248 |  |  | 87,786 |  |  | 95,020 |
Long-lived asset impairment | 6,953 |  |  | 5,508 |  |  | 11,663 |  |  | 13,753 |
Restatement and other charges | (1,076 | ) |  | 1,920 |  |  | (591 | ) |  | 2,721 |
Restructuring and other charges | — |  |  | 366 |  |  | — |  |  | 823 |
Interest expense | 23,337 |  |  | 22,504 |  |  | 45,884 |  |  | 43,925 |
Debt extinguishment costs | 2,450 |  |  | — |  |  | 2,450 |  |  | 291 |
Merger-related costs | 5,686 |  |  | — |  |  | 9,811 |  |  | — |
Other income, net | (1,644 | ) |  | (962 | ) |  | (2,789 | ) |  | (1,756 | )
Income (loss) before income taxes | $ | 2,582 |  |  | $ | (5,616 | ) |  | $ | 5,005 |  |  | $ | (19,306 | )

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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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