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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues $ 189,532 $ 182,910
Operating expenses:    
Cost of operations 127,139 128,518
General and administration 27,131 24,352
Depreciation and amortization 22,682 21,406
Expense from acquisition activities 414 1,009
Southbridge Landfill closure charge 157 613
Total operating expenses 177,523 175,898
Operating income 12,009 7,012
Other expense (income):    
Interest income (64) (51)
Interest expense 5,468 5,952
Other (income) expense (138) 43
Other expense, net 5,266 5,944
Income before income taxes 6,743 1,068
Provision for income taxes 2,432 109
Net income $ 4,311 $ 959
Basic earnings per share attributable to common stockholders:    
Weighted average common shares outstanding 51,179 48,005
Basic earnings per common share (in dollars per share) $ 0.08 $ 0.02
Diluted earnings per share attributable to common stockholders:    
Weighted average common shares outstanding 51,387 48,262
Diluted earnings per common share (in dollars per share) $ 0.08 $ 0.02