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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Revenues $ 198,547 $ 172,832 $ 549,670 $ 485,936
Operating expenses:        
Cost of operations 131,273 114,118 377,707 331,527
General and administration 22,536 20,545 67,423 62,365
Depreciation and amortization 20,940 18,202 58,144 51,572
Withdrawal costs - multiemployer pension plan 3,591 0 3,591 0
Expense from acquisition activities and other items 1,097 581 2,237 930
Southbridge landfill closure charge (settlement), net 625 (9,498) 2,097 (7,740)
Contract settlement charge 0 0 0 2,100
Development project charge 0 0 0 311
Total operating expenses 180,062 143,948 511,199 441,065
Operating income 18,485 28,884 38,471 44,871
Other expense (income):        
Interest income (66) (53) (287) (161)
Interest expense 6,235 6,424 18,849 19,347
Loss on debt extinguishment 0 0 0 7,352
Other income (248) (166) (960) (597)
Other expense, net 5,921 6,205 17,602 25,941
Income before income taxes 12,564 22,679 20,869 18,930
Provision (benefit) for income taxes 178 377 (1,718) (1,166)
Net income $ 12,386 $ 22,302 $ 22,587 $ 20,096
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 47,690 42,779 47,029 42,605
Basic earnings per common share (in dollars per share) $ 0.26 $ 0.52 $ 0.48 $ 0.47
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 48,361 44,175 47,660 43,938
Diluted earnings per common share (in dollars per share) $ 0.26 $ 0.50 $ 0.47 $ 0.46