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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Revenues | $ 160,269 | $ 151,133 | $ 448,087 | $ 421,236
Operating expenses: |  |  |  |
Cost of operations | 103,897 | 98,803 | 300,961 | 284,409
General and administration | 20,750 | 18,777 | 58,388 | 55,450
Depreciation and amortization | 16,591 | 16,175 | 46,307 | 46,430
Southbridge Landfill closure charge | 754 | 0 | 64,868 | 0
Total operating expenses | 141,992 | 133,755 | 470,524 | 386,289
Operating income (loss) | 18,277 | 17,378 | (22,437) | 34,947
Other expense (income): |  |  |  |
Interest income | (58) | (64) | (180) | (229)
Interest expense | 6,268 | 9,643 | 19,052 | 29,677
Loss on debt extinguishment | 0 | 191 | 517 | 736
Other income | (164) | (192) | (567) | (697)
Other expense, net | 6,046 | 9,578 | 18,822 | 29,487
Income (loss) before income taxes | 12,231 | 7,800 | (41,259) | 5,460
Provision for income taxes | 151 | 263 | 561 | 344
Net income (loss) | 12,080 | 7,537 | (41,820) | 5,116
Less: Net loss attributable to noncontrolling interests | 0 | 0 | 0 | (9)
Net income (loss) attributable to common stockholders | $ 12,080 | $ 7,537 | $ (41,820) | $ 5,125
Basic earnings per share attributable to common stockholders: |  |  |  |
Weighted average common shares outstanding (in shares) | 41,951 | 41,377 | 41,783 | 41,169
Basic earnings per common share (in dollars per share) | $ 0.29 | $ 0.18 | $ (1.00) | $ 0.12
Diluted earnings per share attributable to common stockholders: |  |  |  |
Weighted average common shares outstanding (in shares) | 43,295 | 42,287 | 41,783 | 41,896
Diluted earnings per common share (in dollars per share) | $ 0.28 | $ 0.18 | $ (1.00) | $ 0.12

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