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Reportable Segments (Tables) | 9 Months Ended
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Sep. 30, 2017
Segment Reporting [Abstract] |
Revenue and other financial information by reportable segment | The following table presents revenue and other financial information by reportable segment during the three and nine months ended September 30, 2017 and 2016 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Reportable Segments Total
Three months ended September 30, 2017: |  |  |  |  |
Revenue from external customers | $ | 153,524 |  |  | $ | 44,329 |  |  | $ | 197,853 |
Gross margin | 81,573 |  |  | 5,843 |  |  | 87,416 |
Three months ended September 30, 2016: |  |  |  |  |
Revenue from external customers | $ | 156,599 |  |  | $ | 39,250 |  |  | $ | 195,849 |
Gross margin | 96,823 |  |  | 6,500 |  |  | 103,323 |
Nine months ended September 30, 2017: |  |  |  |  |
Revenue from external customers | $ | 454,622 |  |  | $ | 131,098 |  |  | $ | 585,720 |
Gross margin | 256,331 |  |  | 19,271 |  |  | 275,602 |
Nine months ended September 30, 2016: |  |  |  |  |
Revenue from external customers | $ | 495,811 |  |  | $ | 117,478 |  |  | $ | 613,289 |
Gross margin | 308,990 |  |  | 20,013 |  |  | 329,003 |
Reconciliation of net income (loss) to gross margin | The following table reconciles total gross margin to loss before income taxes (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Total gross margin | $ | 87,416 |  |  | $ | 103,323 |  |  | $ | 275,602 |  |  | $ | 329,003 |
Less: |  |  |  |  |  |  |
Selling, general and administrative | 29,108 |  |  | 25,448 |  |  | 81,823 |  |  | 87,745 |
Depreciation and amortization | 47,463 |  |  | 52,068 |  |  | 142,483 |  |  | 157,891 |
Long-lived asset impairment | 7,105 |  |  | 16,713 |  |  | 20,858 |  |  | 40,381 |
Restatement and other charges | 566 |  |  | 426 |  |  | 3,287 |  |  | 860 |
Restructuring and other charges | 422 |  |  | 4,689 |  |  | 1,245 |  |  | 15,758 |
Interest expense | 22,892 |  |  | 21,365 |  |  | 66,817 |  |  | 62,842 |
Debt extinguishment costs | — |  |  | — |  |  | 291 |  |  | — |
Other income, net | (2,716 | ) |  | (2,470 | ) |  | (4,472 | ) |  | (4,640 | )
Loss before income taxes | $ | (17,424 | ) |  | $ | (14,916 | ) |  | $ | (36,730 | ) |  | $ | (31,834 | )

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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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