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Reportable Segments (Tables) | 6 Months Ended
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Jun. 30, 2016
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, 2016 and 2015 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Reportable Segments Total
Three months ended June 30, 2016: |  |  |  |  |
Revenue from external customers | $ | 162,973 |  |  | $ | 41,172 |  |  | $ | 204,145 |
Gross margin | 104,107 |  |  | 6,819 |  |  | 110,926 |
Three months ended June 30, 2015: |  |  |  |  |
Revenue from external customers | $ | 198,259 |  |  | $ | 56,803 |  |  | $ | 255,062 |
Gross margin | 117,038 |  |  | 10,959 |  |  | 127,997 |
Six months ended June 30, 2016: |  |  |  |  |
Revenue from external customers | $ | 339,212 |  |  | $ | 78,228 |  |  | $ | 417,440 |
Gross margin | 212,167 |  |  | 13,513 |  |  | 225,680 |
Six months ended June 30, 2015: |  |  |  |  |
Revenue from external customers | $ | 400,520 |  |  | $ | 107,415 |  |  | $ | 507,935 |
Gross margin | 236,620 |  |  | 20,794 |  |  | 257,414 |
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Total gross margin | $ | 110,926 |  |  | $ | 127,997 |  |  | $ | 225,680 |  |  | $ | 257,414 |
Less: |  |  |  |  |  |  |
Selling, general and administrative | 28,080 |  |  | 31,357 |  |  | 62,731 |  |  | 63,925 |
Depreciation and amortization | 51,896 |  |  | 57,539 |  |  | 105,823 |  |  | 114,552 |
Long-lived asset impairment | 13,808 |  |  | 9,510 |  |  | 23,668 |  |  | 17,663 |
Restructuring and other charges | 3,004 |  |  | 1,193 |  |  | 11,069 |  |  | 1,193 |
Interest expense | 21,177 |  |  | 28,079 |  |  | 41,477 |  |  | 54,870 |
Other income, net | (181 | ) |  | (2,482 | ) |  | (2,170 | ) |  | (3,032 | )
Income (loss) before income taxes | $ | (6,858 | ) |  | $ | 2,801 |  |  | $ | (16,918 | ) |  | $ | 8,243 |

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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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