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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue: |  |  |
Services | $ 1,199,011 | $ 1,415,803 | $ 1,475,088
Operating expenses: |  |  |
Cost of services sold | 769,899 | 961,076 | 991,198
Office and general expenses | 341,565 | 328,339 | 349,056
Depreciation and amortization | 36,905 | 38,329 | 46,196
Impairment and other losses | 96,399 | 8,599 | 87,204
Costs and Expenses, Total | 1,244,768 | 1,336,343 | 1,473,654
Operating income (loss) | (45,757) | 79,460 | 1,434
Other income (expense): |  |  |
Interest expense and finance charges, net | (62,163) | (64,942) | (67,075)
Foreign exchange gain (loss) | (982) | 8,750 | (23,258)
Other, net | 20,500 | (2,401) | 230
Nonoperating Income (Expense), Total | (42,645) | (58,593) | (90,103)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates | (88,402) | 20,867 | (88,669)
Income tax expense | 116,555 | 10,316 | 29,615
Income (loss) before equity in earnings of non-consolidated affiliates | (204,957) | 10,551 | (118,284)
Equity in earnings (losses) of non-consolidated affiliates | (2,240) | 352 | 62
Net income (loss) | (207,197) | 10,903 | (118,222)
Net income attributable to the noncontrolling interest | (21,774) | (16,156) | (11,785)
Net loss attributable to MDC Partners Inc. | (228,971) | (5,253) | (130,007)
Net loss attributable to MDC Partners Inc. common shareholders | $ (243,150) | $ (17,557) | $ (138,362)
Basic and diluted |  |  |
Earnings per share, basic | $ (3.34) | $ (0.25) | $ (2.42)
Earnings per share, diluted | $ (3.34) | $ (0.25) | $ (2.42)
Weighted Average Number of Common Shares Outstanding: |  |  |
Weighted Average Number of Shares Outstanding, Basic | 72,862,178 | 69,132,100 | 57,218,994
Weighted Average Number of Shares Outstanding, Diluted | 72,862,178 | 69,132,100 | 57,218,994
Series 4 Convertible Preferred Stock | Convertible Preference Shares |  |  |
Other income (expense): |  |  |
Accretion on and net income allocated to convertible preference shares | $ (14,179) | $ (12,304) | $ (8,355)

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