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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenues $ 774,584,000 $ 743,290,000 $ 660,660,000
Operating expenses:      
Cost of operations 515,646,000 508,656,000 453,291,000
General and administration 102,410,000 92,782,000 84,791,000
Depreciation and amortization 90,782,000 79,790,000 70,508,000
Southbridge Landfill closure charge, net 4,587,000 2,709,000 8,054,000
Expense from acquisition activities and other items 1,862,000 2,687,000 1,872,000
Withdrawal costs - multiemployer pension plan 0 3,591,000 0
Contract settlement charge 0 0 2,100,000
Development project charge 0 0 311,000
Total operating expenses 715,287,000 690,215,000 620,927,000
Operating income 59,297,000 53,075,000 39,733,000
Other expense (income):      
Interest income (303,000) (367,000) (273,000)
Interest expense 22,371,000 25,102,000 26,294,000
Loss on debt extinguishment 0 0 7,352,000
Impairment of investments 0 0 1,069,000
Other income (1,073,000) (1,439,000) (745,000)
Other expense, net 20,995,000 23,296,000 33,697,000
Income before income taxes 38,302,000 29,779,000 6,036,000
Benefit for income taxes (52,804,000) (1,874,000) (384,000)
Net income $ 91,106,000 $ 31,653,000 $ 6,420,000
Basic earnings per common share:      
Weighted average common shares outstanding 48,793 47,226 42,688
Basic earnings per common share (in dollars per share) $ 1.87 $ 0.67 $ 0.15
Diluted earnings per common share:      
Weighted average common shares outstanding 49,045 47,966 44,168
Diluted earnings per common share (in dollars per share) $ 1.86 $ 0.66 $ 0.15