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Reportable Segments (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2017 and 2016 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Reportable Segments Total
Three Months Ended June 30, 2017: |  |  |  |  |
Revenue from external customers | $ | 151,114 |  |  | $ | 46,868 |  |  | $ | 197,982 |
Gross margin | 88,871 |  |  | 7,259 |  |  | 96,130 |
Three months ended June 30, 2016: |  |  |  |  |
Revenue from external customers | $ | 162,973 |  |  | $ | 41,172 |  |  | $ | 204,145 |
Gross margin | 104,107 |  |  | 6,819 |  |  | 110,926 |
Six Months Ended June 30, 2017: |  |  |  |  |
Revenue from external customers | $ | 301,098 |  |  | $ | 86,769 |  |  | $ | 387,867 |
Gross margin | 174,758 |  |  | 13,428 |  |  | 188,186 |
Six months ended June 30, 2016: |  |  |  |  |
Revenue from external customers | $ | 339,212 |  |  | $ | 78,228 |  |  | $ | 417,440 |
Gross margin | 212,167 |  |  | 13,513 |  |  | 225,680 |
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 June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Total gross margin | $ | 96,130 |  |  | $ | 110,926 |  |  | $ | 188,186 |  |  | $ | 225,680 |
Less: |  |  |  |  |  |  |
Selling, general and administrative | 25,162 |  |  | 27,646 |  |  | 52,715 |  |  | 62,297 |
Depreciation and amortization | 47,248 |  |  | 51,896 |  |  | 95,020 |  |  | 105,823 |
Long-lived asset impairment | 5,508 |  |  | 13,808 |  |  | 13,753 |  |  | 23,668 |
Restatement and other charges | 1,920 |  |  | 434 |  |  | 2,721 |  |  | 434 |
Restructuring and other charges | 366 |  |  | 3,004 |  |  | 823 |  |  | 11,069 |
Interest expense | 22,504 |  |  | 21,177 |  |  | 43,925 |  |  | 41,477 |
Debt extinguishment costs | — |  |  | — |  |  | 291 |  |  | — |
Other income, net | (962 | ) |  | (181 | ) |  | (1,756 | ) |  | (2,170 | )
Loss before income taxes | $ | (5,616 | ) |  | $ | (6,858 | ) |  | $ | (19,306 | ) |  | $ | (16,918 | )

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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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