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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]      
Revenues $ 1,085,089 $ 889,211 $ 774,584
Operating expenses:      
Cost of operations 723,117 582,403 515,646
General and administration 133,419 118,834 102,410
Depreciation and amortization 126,351 103,590 90,782
Expense from acquisition activities 4,613 5,304 1,862
Southbridge Landfill closure charge, net 1,436 496 4,587
Environmental remediation charge 759 924 0
Total operating expenses 989,695 811,551 715,287
Operating income 95,394 77,660 59,297
Other expense (income):      
Interest income (709) (302) (303)
Interest expense 23,722 21,229 22,371
Other income (2,585) (1,313) (1,073)
Other expense, net 20,428 19,614 20,995
Income before income taxes 74,966 58,046 38,302
Provision (benefit) for income taxes 21,887 16,946 (52,804)
Net income $ 53,079 $ 41,100 $ 91,106
Basic earnings per share attributable to common stockholders:      
Weighted average common shares outstanding 51,623 51,312 48,793
Basic earnings per common share (in dollars per share) $ 1.03 $ 0.80 $ 1.87
Diluted earnings per share attributable to common stockholders:      
Weighted average common shares outstanding 51,767 51,515 49,045
Diluted earnings per common share (in dollars per share) $ 1.03 $ 0.80 $ 1.86