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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Revenues $ 889,211 $ 774,584 $ 743,290
Operating expenses:      
Cost of operations 582,403 515,646 508,656
General and administration 118,834 102,410 92,782
Depreciation and amortization 103,590 90,782 79,790
Expense from acquisition activities 5,304 1,862 2,687
Southbridge Landfill closure charge, net 496 4,587 2,709
Environmental remediation charge 924 0 0
Withdrawal costs - multiemployer pension plan 0 0 3,591
Total operating expenses 811,551 715,287 690,215
Operating income 77,660 59,297 53,075
Other expense (income):      
Interest income (302) (303) (367)
Interest expense 21,229 22,371 25,102
Other income (1,313) (1,073) (1,439)
Other expense, net 19,614 20,995 23,296
Income before income taxes 58,046 38,302 29,779
Provision (benefit) for income taxes 16,946 (52,804) (1,874)
Net income $ 41,100 $ 91,106 $ 31,653
Basic earnings per share attributable to common stockholders:      
Weighted average common shares outstanding 51,312 48,793 47,226
Basic earnings per common share (in dollars per share) $ 0.80 $ 1.87 $ 0.67
Diluted earnings per share attributable to common stockholders:      
Weighted average common shares outstanding 51,515 49,045 47,966
Diluted earnings per common share (in dollars per share) $ 0.80 $ 1.86 $ 0.66