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Segments (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Revenue and other financial information by reportable segment | The following table presents revenue, gross margin and capital expenditures by segment during the years ended December 31, 2018, 2017 and 2016 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Segments Total |  | Other (1) |  | Total (2)
2018: |  |  |  |  |  |  |  |  |
Revenue | $ | 672,536 |  |  | $ | 231,905 |  |  | $ | 904,441 |  |  | $ | — |  |  | $ | 904,441 |
Gross margin | 399,523 |  |  | 40,551 |  |  | 440,074 |  |  | — |  |  | 440,074 |
Capital expenditures | 307,048 |  |  | 6,111 |  |  | 313,159 |  |  | 5,943 |  |  | 319,102 |
2017: |  |  |  |  |  |  |  |  |
Revenue | $ | 610,921 |  |  | $ | 183,734 |  |  | $ | 794,655 |  |  | $ | — |  |  | $ | 794,655 |
Gross margin | 347,916 |  |  | 27,817 |  |  | 375,733 |  |  | — |  |  | 375,733 |
Capital expenditures | 211,651 |  |  | 3,429 |  |  | 215,080 |  |  | 6,613 |  |  | 221,693 |
2016: |  |  |  |  |  |  |  |  |
Revenue | $ | 647,828 |  |  | $ | 159,241 |  |  | $ | 807,069 |  |  | $ | — |  |  | $ | 807,069 |
Gross margin | 400,788 |  |  | 26,362 |  |  | 427,150 |  |  | — |  |  | 427,150 |
Capital expenditures | 111,170 |  |  | 1,123 |  |  | 112,293 |  |  | 5,279 |  |  | 117,572 |
——————
(1) | Includes corporate-related items.
(2) | Excludes capital expenditures and the operating results of discontinued operations.
Reconciliation of Assets from Segment to Consolidated | The following table presents assets by segment reconciled to total assets per the consolidated balance sheets (in thousands):
| December 31,
| 2018 |  | 2017
Contract operations | $ | 2,155,270 |  |  | $ | 2,063,178 |
Aftermarket services | 92,101 |  |  | 104,440 |
Assets from segments | 2,247,371 |  |  | 2,167,618 |
Other assets (1) | 297,781 |  |  | 226,826 |
Assets associated with discontinued operations | 7,363 |  |  | 13,563 |
Total assets | $ | 2,552,515 |  |  | $ | 2,408,007 |
——————
(1) | Includes corporate-related items.
Reconciliation of net income (loss) to gross margin | The following table reconciles total gross margin to net income (loss) before income taxes (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Total gross margin | $ | 440,074 |  |  | $ | 375,733 |  |  | $ | 427,150 |
Less: |  |  |  |  |
Selling, general and administrative | 101,563 |  |  | 111,483 |  |  | 114,470 |
Depreciation and amortization | 174,946 |  |  | 188,563 |  |  | 208,986 |
Long-lived asset impairment | 28,127 |  |  | 29,142 |  |  | 87,435 |
Restatement and other charges | 19 |  |  | 4,370 |  |  | 13,470 |
Restructuring and other charges | — |  |  | 1,386 |  |  | 16,901 |
Interest expense | 93,328 |  |  | 88,760 |  |  | 83,899 |
Debt extinguishment loss | 2,450 |  |  | 291 |  |  | — |
Merger-related costs | 10,162 |  |  | 275 |  |  | — |
Other income, net | (5,831 | ) |  | (5,918 | ) |  | (8,590 | )
Income (loss) before income taxes | $ | 35,310 |  |  | $ | (42,619 | ) |  | $ | (89,421 | )

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