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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Revenues | $ 599,309 | $ 565,030 | $ 546,500
Operating expenses: |  |  |
Cost of operations | 405,188 | 381,973 | 382,615
General and administration | 79,243 | 75,356 | 72,892
Depreciation and amortization | 62,102 | 61,856 | 62,704
Southbridge Landfill closure charge | 65,183 | 0 | 0
Expense from divestiture, acquisition and financing costs | 176 | 0 | 0
Environmental remediation charge | 0 | 900 | 0
Contract settlement charge | 0 | 0 | 1,940
Divestiture transactions | 0 | 0 | (5,517)
Total operating expenses | 611,892 | 520,085 | 514,634
Operating (loss) income | (12,583) | 44,945 | 31,866
Other expense (income): |  |  |
Interest income | (273) | (290) | (330)
Interest expense | 25,160 | 38,942 | 40,420
Loss on debt extinguishment | 517 | 13,747 | 999
Loss on derivative instruments | 0 | 0 | 227
Impairment of investments | 0 | 0 | 2,099
Other income | (935) | (1,090) | (1,119)
Other expense, net | 24,469 | 51,309 | 42,296
Loss before income taxes | (37,052) | (6,364) | (10,430)
(Benefit) provision for income taxes | (15,253) | 494 | 1,351
Net loss | (21,799) | (6,858) | (11,781)
Less: Net (loss) income attributable to noncontrolling interests | 0 | (9) | 1,188
Net loss attributable to common stockholders | (21,799) | (6,849) | (12,969)
Net loss attributable to common stockholders: |  |  |
Net loss attributable to common stockholders | $ (21,799) | $ (6,849) | $ (12,969)
Weighted average common shares outstanding: |  |  |
Basic and diluted (in shares) | 41,846 | 41,233 | 40,642
Basic and diluted earnings per share: |  |  |
Net loss per common share (in dollars per share) | $ (0.52) | $ (0.17) | $ (0.32)

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