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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