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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenues | $ 172,832 | $ 160,269 | $ 485,936 | $ 448,087
Operating expenses: |  |  |  |
Cost of operations | 114,118 | 103,897 | 331,527 | 300,961
General and administration | 20,545 | 20,750 | 62,365 | 58,388
Depreciation and amortization | 18,202 | 16,591 | 51,572 | 46,307
Expense from acquisition activities and other items | 581 | 0 | 930 | 0
Southbridge Landfill closure (settlement) charge, net | (9,498) | 754 | (7,740) | 64,868
Contract settlement charge | 0 | 0 | 2,100 | 0
Development project charge | 0 | 0 | 311 | 0
Total operating expenses | 143,948 | 141,992 | 441,065 | 470,524
Operating income (loss) | 28,884 | 18,277 | 44,871 | (22,437)
Other expense (income): |  |  |  |
Interest income | (53) | (58) | (161) | (180)
Interest expense | 6,424 | 6,268 | 19,347 | 19,052
Loss on debt extinguishment | 0 | 0 | 7,352 | 517
Other income | (166) | (164) | (597) | (567)
Other expense, net | 6,205 | 6,046 | 25,941 | 18,822
Income (loss) before income taxes | 22,679 | 12,231 | 18,930 | (41,259)
Provision (benefit) for income taxes | 377 | 151 | (1,166) | 561
Net income (loss) | $ 22,302 | $ 12,080 | $ 20,096 | $ (41,820)
Basic earnings per share attributable to common stockholders: |  |  |  |
Basic weighted average common share outstanding (in shares) | 42,779 | 41,951 | 42,605 | 41,783
Basic earnings per common share (in dollars per share) | $ 0.52 | $ 0.29 | $ 0.47 | $ (1.00)
Diluted earnings per share attributable to common stockholders: |  |  |  |
Diluted weighted average shares outstanding (in shares) | 44,175 | 43,295 | 43,938 | 41,783
Diluted earnings per common share (in dollars per share) | $ 0.50 | $ 0.28 | $ 0.46 | $ (1.00)

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