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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

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