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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Revenues $ 234,027 $ 189,532
Operating expenses:    
Cost of operations 162,455 127,139
General and administration 29,793 27,131
Depreciation and amortization 29,428 22,682
Expense from acquisition activities 2,043 414
Southbridge Landfill closure charge 140 157
Total operating expenses 223,859 177,523
Operating income 10,168 12,009
Other expense (income):    
Interest income (40) (64)
Interest expense 5,204 5,468
Other income (144) (138)
Other expense, net 5,020 5,266
Income before income taxes 5,148 6,743
Provision for income taxes 958 2,432
Net income $ 4,190 $ 4,311
Basic earnings per share attributable to common stockholders:    
Weighted average common shares outstanding, basic (in shares) 51,490 51,179
Basic earnings per common share (in dollars per share) $ 0.08 $ 0.08
Diluted earnings per share attributable to common stockholders:    
Weighted average common shares outstanding, diluted (in shares) 51,657 51,387
Diluted earnings per common share (in dollars per share) $ 0.08 $ 0.08