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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)