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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Revenues $ 283,666 $ 215,875 $ 517,693 $ 405,406
Operating expenses:        
Cost of operations 186,038 138,553 348,493 265,691
General and administration 33,562 29,212 63,354 56,343
Depreciation and amortization 31,150 24,337 60,579 47,019
Expense from acquisition activities 1,019 1,632 3,062 2,046
Southbridge Landfill closure charge 178 195 318 352
Total operating expenses 251,947 193,929 475,806 371,451
Operating income 31,719 21,946 41,887 33,955
Other expense (income):        
Interest income (42) (66) (81) (130)
Interest expense 5,698 5,296 10,902 10,764
Other income (312) (510) (457) (648)
Other expense, net 5,344 4,720 10,364 9,986
Income before income taxes 26,375 17,226 31,523 23,969
Provision for income taxes 8,579 5,443 9,537 7,875
Net income $ 17,796 $ 11,783 $ 21,986 $ 16,094
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, basic (in shares) 51,642 51,366 51,567 51,273
Basic earnings per common share (in dollars per share) $ 0.34 $ 0.23 $ 0.43 $ 0.31
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, diluted (in shares) 51,781 51,546 51,720 51,466
Diluted earnings per common share (in dollars per share) $ 0.34 $ 0.23 $ 0.43 $ 0.31