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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Revenues $ 295,268 $ 241,969 $ 812,962 $ 647,375
Operating expenses:        
Cost of operations 190,285 153,892 538,779 419,583
General and administration 34,348 30,993 97,702 87,336
Depreciation and amortization 32,527 27,491 93,106 74,510
Expense from acquisition activities 816 1,904 3,878 3,950
Environmental remediation charge 759 0 759 0
Southbridge Landfill closure charge 245 302 563 653
Total operating expenses 258,980 214,582 734,787 586,032
Operating income 36,288 27,387 78,175 61,343
Other expense (income):        
Interest income (178) (61) (260) (191)
Interest expense 6,177 5,164 17,078 15,928
Other income (1,523) (178) (1,978) (825)
Other expense, net 4,476 4,925 14,840 14,912
Income before income taxes 31,812 22,462 63,335 46,431
Provision for income taxes 9,140 6,601 18,677 14,476
Net income $ 22,672 $ 15,861 $ 44,658 $ 31,955
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, basic (in shares) 51,677 51,389 51,604 51,312
Basic earnings per common share (in dollars per share) $ 0.44 $ 0.31 $ 0.87 $ 0.62
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, diluted (in shares) 51,806 51,586 51,749 51,506
Diluted earnings per common share (in dollars per share) $ 0.44 $ 0.31 $ 0.86 $ 0.62