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Reportable Segments and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Sales and other financial information by reportable segment | The following table presents sales and other financial information by reportable segment during the years ended December 31, 2015, 2014 and 2013 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Reportable Segments Total |  | Other (1) |  | Total (2)
2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ | 781,166 |  |  | $ | 216,942 |  |  | $ | 998,108 |  |  | $ | — |  |  | $ | 998,108 |
Gross margin (3) | 461,765 |  |  | 41,297 |  |  | 503,062 |  |  | — |  |  | 503,062 |
Total assets | 2,248,191 |  |  | 149,008 |  |  | 2,397,199 |  |  | 287,944 |  |  | 2,685,143 |
Capital expenditures | 227,248 |  |  | 2,296 |  |  | 229,544 |  |  | 26,598 |  |  | 256,142 |
2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ | 729,103 |  |  | $ | 230,050 |  |  | $ | 959,153 |  |  | $ | — |  |  | $ | 959,153 |
Gross margin (3) | 412,961 |  |  | 41,799 |  |  | 454,760 |  |  | — |  |  | 454,760 |
Total assets | 2,446,633 |  |  | 62,485 |  |  | 2,509,118 |  |  | 334,516 |  |  | 2,843,634 |
Capital expenditures | 371,734 |  |  | 825 |  |  | 372,559 |  |  | 11,282 |  |  | 383,841 |
2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ | 627,844 |  |  | $ | 234,928 |  |  | $ | 862,772 |  |  | $ | — |  |  | $ | 862,772 |
Gross margin (3) | 345,355 |  |  | 46,439 |  |  | 391,794 |  |  | — |  |  | 391,794 |
Total assets | 1,907,097 |  |  | 67,693 |  |  | 1,974,790 |  |  | 238,220 |  |  | 2,213,010 |
Capital expenditures | 275,408 |  |  | 935 |  |  | 276,343 |  |  | 15,187 |  |  | 291,530 |
(1) | Includes corporate related items.
(2) | Totals exclude assets, capital expenditures and the operating results of discontinued operations.
(3) | Gross margin, a non-GAAP financial measure, is reconciled, in total, to net income (loss), its most directly comparable measure calculated and presented in accordance with U.S. GAAP, below.
Assets from reportable segments to total assets | The following table presents assets from reportable segments to total assets as of December 31, 2015 and 2014 (in thousands):
| December 31,
| 2015 |  | 2014
Assets from reportable segments | $ | 2,397,199 |  |  | $ | 2,509,118 |
Other assets (1) | 287,944 |  |  | 334,516 |
Assets associated with discontinued operations | 21,620 |  |  | 2,083,205 |
Consolidated assets | $ | 2,706,763 |  |  | $ | 4,926,839 |
(1) | Includes corporate related items.
Reconciliation of net income (loss) to gross margin | The following table reconciles net income (loss) to gross margin (in thousands):
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Net income (loss) | $ | (98,966 | ) |  | $ | 125,882 |  |  | $ | 155,742 |
Selling, general and administrative | 131,919 |  |  | 132,651 |  |  | 118,851 |
Depreciation and amortization | 229,127 |  |  | 212,268 |  |  | 187,476 |
Long-lived asset impairment | 124,979 |  |  | 42,828 |  |  | 16,696 |
Restructuring charges | 4,745 |  |  | 5,394 |  |  | — |
Goodwill impairment | 3,738 |  |  | — |  |  | — |
Interest expense | 107,617 |  |  | 112,273 |  |  | 112,194 |
Debt extinguishment costs | 9,201 |  |  | — |  |  | — |
Other (income) expense, net | (2,079 | ) |  | (5,475 | ) |  | (22,535 | )
Provision for (benefit from) income taxes | 53,189 |  |  | (28,066 | ) |  | (17,840 | )
Income from discontinued operations, net of tax | (60,408 | ) |  | (142,995 | ) |  | (158,790 | )
Gross margin | $ | 503,062 |  |  | $ | 454,760 |  |  | $ | 391,794 |

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