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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Revenues $ 352,735 $ 295,268 $ 904,975 $ 812,962
Operating expenses:        
Cost of operations 226,303 190,285 592,865 538,779
General and administration 41,177 34,348 112,721 97,702
Depreciation and amortization 47,736 32,527 116,095 93,106
Expense from acquisition activities 3,261 816 9,801 3,878
Southbridge Landfill closure charge 70 245 276 563
Legal settlement 0 0 6,150 0
Environmental remediation charge 0 759 0 759
Total operating expenses 318,547 258,980 837,908 734,787
Operating income 34,188 36,288 67,067 78,175
Other expense (income):        
Interest income (5,525) (178) (7,820) (260)
Interest expense 15,748 6,177 31,708 17,078
Loss from termination of bridge financing 0 0 8,191 0
Other income (225) (1,523) (1,019) (1,978)
Other expense, net 9,998 4,476 31,060 14,840
Income before income taxes 24,190 31,812 36,007 63,335
Provision for income taxes 6,018 9,140 8,797 18,677
Net income $ 18,172 $ 22,672 $ 27,210 $ 44,658
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, basic (in shares) 57,962 51,677 54,228 51,604
Basic earnings per common share (in dollars per share) $ 0.31 $ 0.44 $ 0.50 $ 0.87
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, diluted (in shares) 58,062 51,806 54,325 51,749
Diluted earnings per common share (in dollars per share) $ 0.31 $ 0.44 $ 0.50 $ 0.86