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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |  |
Revenues | $ 743,290,000 | $ 660,660,000 | $ 599,309,000
Operating expenses: |  |  |
Cost of operations | 508,656,000 | 453,291,000 | 405,188,000
General and administration | 92,782,000 | 84,791,000 | 79,243,000
Depreciation and amortization | 79,790,000 | 70,508,000 | 62,102,000
Southbridge Landfill closure charge, net | 2,709,000 | 8,054,000 | 65,183,000
Withdrawal costs - multiemployer pension plan | 3,591,000 | 0 | 0
Expense from acquisition activities and other items | 2,687,000 | 1,872,000 | 176,000
Contract settlement charge | 0 | 2,100,000 | 0
Development project charge | 0 | 311,000 | 0
Total operating expenses | 690,215,000 | 620,927,000 | 611,892,000
Operating income (loss) | 53,075,000 | 39,733,000 | (12,583,000)
Other expense (income): |  |  |
Interest income | (367,000) | (273,000) | (273,000)
Interest expense | 25,102,000 | 26,294,000 | 25,160,000
Loss on debt extinguishment | 0 | 7,352,000 | 517,000
Impairment of investments | 0 | 1,069,000 | 0
Other income | (1,439,000) | (745,000) | (935,000)
Other expense, net | 23,296,000 | 33,697,000 | 24,469,000
Income (loss) before income taxes | 29,779,000 | 6,036,000 | (37,052,000)
Benefit for income taxes | (1,874,000) | (384,000) | (15,253,000)
Net income (loss) | $ 31,653,000 | $ 6,420,000 | $ (21,799,000)
Basic earnings (loss) per common share: |  |  |
Weighted average common shares outstanding | 47,226 | 42,688 | 41,846
Basic earnings (loss) per common share (in dollars per share) | $ 0.67 | $ 0.15 | $ (0.52)
Diluted earnings (loss) per common share: |  |  |
Weighted average common shares outstanding | 47,966 | 44,168 | 41,846
Diluted earnings (loss) per common share (in dollars per share) | $ 0.66 | $ 0.15 | $ (0.52)

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Period Type: | duration

X
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Data Type: | xbrli:sharesItemType
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