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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Revenues $ 215,875 $ 188,767 $ 405,406 $ 371,676
Operating expenses:        
Cost of operations 138,553 123,462 265,691 251,980
General and administration 29,212 24,874 56,343 49,226
Depreciation and amortization 24,337 22,076 47,019 43,482
Expense from acquisition activities 1,632 352 2,046 1,360
Southbridge Landfill closure charge 195 559 352 1,172
Total operating expenses 193,929 171,323 371,451 347,220
Operating income 21,946 17,444 33,955 24,456
Other expense (income):        
Interest income (66) (45) (130) (96)
Interest expense 5,296 5,511 10,764 11,463
Other income (510) (492) (648) (449)
Other expense, net 4,720 4,974 9,986 10,918
Income before income taxes 17,226 12,470 23,969 13,538
Provision for income taxes 5,443 357 7,875 466
Net income $ 11,783 $ 12,113 $ 16,094 $ 13,072
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 51,366 48,348 51,273 48,176
Basic earnings per common share (in dollars per share) $ 0.23 $ 0.25 $ 0.31 $ 0.27
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 51,546 48,563 51,466 48,411
Diluted earnings per common share (in dollars per share) $ 0.23 $ 0.25 $ 0.31 $ 0.27