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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Revenues $ 188,767 $ 187,459 $ 371,676 $ 351,123
Operating expenses:        
Cost of operations 123,462 128,674 251,980 246,434
General and administration 24,874 22,145 49,226 44,887
Depreciation and amortization 22,076 19,715 43,482 37,204
Southbridge Landfill closure charge 559 917 1,172 1,472
Expense from acquisition activities 352 464 1,360 1,140
Total operating expenses 171,323 171,915 347,220 331,137
Operating income 17,444 15,544 24,456 19,986
Other expense (income):        
Interest income (45) (105) (96) (222)
Interest expense 5,511 6,155 11,463 12,615
Other income (492) (496) (449) (711)
Other expense, net 4,974 5,554 10,918 11,682
Income before income taxes 12,470 9,990 13,538 8,304
Provision (benefit) for income taxes 357 (1,925) 466 (1,897)
Net income $ 12,113 $ 11,915 $ 13,072 $ 10,201
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 48,348 47,464 48,176 46,693
Basic earnings per common share (in dollars per share) $ 0.25 $ 0.25 $ 0.27 $ 0.22
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 48,563 48,221 48,411 47,424
Diluted earnings per common share (in dollars per share) $ 0.25 $ 0.25 $ 0.27 $ 0.22