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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement [Abstract] |  |  |
Revenues | $ 774,584,000 | $ 743,290,000 | $ 660,660,000
Operating expenses: |  |  |
Cost of operations | 515,646,000 | 508,656,000 | 453,291,000
General and administration | 102,410,000 | 92,782,000 | 84,791,000
Depreciation and amortization | 90,782,000 | 79,790,000 | 70,508,000
Southbridge Landfill closure charge, net | 4,587,000 | 2,709,000 | 8,054,000
Expense from acquisition activities and other items | 1,862,000 | 2,687,000 | 1,872,000
Withdrawal costs - multiemployer pension plan | 0 | 3,591,000 | 0
Contract settlement charge | 0 | 0 | 2,100,000
Development project charge | 0 | 0 | 311,000
Total operating expenses | 715,287,000 | 690,215,000 | 620,927,000
Operating income | 59,297,000 | 53,075,000 | 39,733,000
Other expense (income): |  |  |
Interest income | (303,000) | (367,000) | (273,000)
Interest expense | 22,371,000 | 25,102,000 | 26,294,000
Loss on debt extinguishment | 0 | 0 | 7,352,000
Impairment of investments | 0 | 0 | 1,069,000
Other income | (1,073,000) | (1,439,000) | (745,000)
Other expense, net | 20,995,000 | 23,296,000 | 33,697,000
Income before income taxes | 38,302,000 | 29,779,000 | 6,036,000
Benefit for income taxes | (52,804,000) | (1,874,000) | (384,000)
Net income | $ 91,106,000 | $ 31,653,000 | $ 6,420,000
Basic earnings per common share: |  |  |
Weighted average common shares outstanding | 48,793 | 47,226 | 42,688
Basic earnings per common share (in dollars per share) | $ 1.87 | $ 0.67 | $ 0.15
Diluted earnings per common share: |  |  |
Weighted average common shares outstanding | 49,045 | 47,966 | 44,168
Diluted earnings per common share (in dollars per share) | $ 1.86 | $ 0.66 | $ 0.15

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