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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2014
Income Statement [Abstract] |  |  |  |
Revenues | $ 368,374 | $ 565,030 | $ 546,500 | $ 497,633
Operating expenses: |  |  |  |
Cost of operations | 258,650 | 381,973 | 382,615 | 354,592
General and administration | 45,732 | 75,356 | 72,892 | 61,865
Depreciation and amortization | 41,485 | 61,856 | 62,704 | 60,339
Environmental remediation charge | 950 | 900 | 0 | 400
Contract settlement charge | 0 | 0 | 1,940 | 0
Divestiture transactions | (553) | 0 | (5,517) | 7,455
Development project charge | 0 | 0 | 0 | 1,394
Severance and reorganization costs | 0 | 0 | 0 | 586
Expense from divestiture, acquisition and financing costs | 0 | 0 | 0 | 144
Gain on settlement of acquisition related contingent consideration | 0 | 0 | 0 | (1,058)
Total operating expenses | 346,264 | 520,085 | 514,634 | 485,717
Operating income | 22,110 | 44,945 | 31,866 | 11,916
Other expense (income): |  |  |  |
Interest income | (247) | (290) | (330) | (312)
Interest expense | 25,639 | 38,942 | 40,420 | 38,175
Loss on debt extinguishment | 0 | 13,747 | 999 | 0
Loss on derivative instruments | 225 | 0 | 227 | 280
Impairment of investments | 2,320 | 0 | 2,099 | 0
Loss from equity method investments | 0 | 0 | 0 | 936
Gain on sale of equity method investment | 0 | 0 | 0 | (593)
Other income | (720) | (1,090) | (1,119) | (1,059)
Other expense, net | 27,217 | 51,309 | 42,296 | 37,427
Loss from continuing operations before income taxes and discontinued operations | (5,107) | (6,364) | (10,430) | (25,511)
Provision for income taxes | 703 | 494 | 1,351 | 1,799
Loss from continuing operations before discontinued operations | (5,810) | (6,858) | (11,781) | (27,310)
Discontinued operations: |  |  |  |
Income from discontinued operations, net of income tax provision of $0, $0, $0 and $0 | 0 | 0 | 0 | 284
Loss on disposal of discontinued operations, net of income tax provision of $0, $0, $0 and $0 | 0 | 0 | 0 | (378)
Net loss | (5,810) | (6,858) | (11,781) | (27,404)
Less: Net (loss) income attributable to noncontrolling interests | 208 | (9) | 1,188 | (4,309)
Net loss attributable to common stockholders | (6,018) | (6,849) | (12,969) | (23,095)
Net loss attributable to common stockholders: |  |  |  |
Continuing operations, net of tax | (6,018) | (6,849) | (12,969) | (23,001)
Discontinued operations, net of tax | 0 | 0 | 0 | (94)
Net loss attributable to common stockholders | $ (6,018) | $ (6,849) | $ (12,969) | $ (23,095)
Weighted average common shares outstanding: |  |  |  |
Weighted average common shares outstanding, basic and diluted (in shares) | 40,262 | 41,233 | 40,642 | 39,820
Basic and diluted earnings per share: |  |  |  |
Basic and diluted earnings per share, Continuing operations, net of tax (in USD per share) | $ (0.15) | $ (0.17) | $ (0.32) | $ (0.58)
Basic and diluted earnings per share, Discontinued operations, net of tax (in USD per share) | 0.00 | 0.00 | 0.00 | 0.00
Net loss per common share (in USD per share) | $ (0.15) | $ (0.17) | $ (0.32) | $ (0.58)

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