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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenues $ 241,969 $ 202,667 $ 647,375 $ 574,344
Operating expenses:        
Cost of operations 153,892 130,406 419,583 382,386
General and administration 30,993 25,014 87,336 74,240
Depreciation and amortization 27,491 23,799 74,510 67,281
Expense from acquisition activities 1,904 173 3,950 1,533
Southbridge Landfill closure charge 302 2,642 653 3,815
Total operating expenses 214,582 182,034 586,032 529,255
Operating income 27,387 20,633 61,343 45,089
Other expense (income):        
Interest income (61) (107) (191) (203)
Interest expense 5,164 5,406 15,928 16,869
Other income (178) (157) (825) (606)
Other expense, net 4,925 5,142 14,912 16,060
Income before income taxes 22,462 15,491 46,431 29,029
Provision for income taxes 6,601 374 14,476 840
Net income $ 15,861 $ 15,117 $ 31,955 $ 28,189
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, basic (in shares) 51,389 48,370 51,312 48,241
Basic earnings per common share (in dollars per share) $ 0.31 $ 0.31 $ 0.62 $ 0.58
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding, diluted (in shares) 51,586 48,619 51,506 48,481
Diluted earnings per common share (in dollars per share) $ 0.31 $ 0.31 $ 0.62 $ 0.58