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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Revenue: |  |  |  |
Services | $ 259,678 | $ 362,130 | $ 587,420 | $ 690,921
Operating expenses: |  |  |  |
Cost of services sold | 165,632 | 240,749 | 388,325 | 477,903
Office and general expenses | 66,210 | 87,276 | 132,563 | 154,394
Depreciation and amortization | 8,899 | 10,663 |  | 19,501
Impairment and other losses | 18,839 | 0 | 19,000 | 0
Costs and Expenses, Total | 259,580 | 338,688 | 557,993 | 651,798
Operating income (loss) | 98 | 23,442 | 29,427 | 39,123
Other income (expense): |  |  |  |
Interest expense and finance charges, net | (15,941) | (16,413) | (31,553) | (33,174)
Other, net | 5,884 | (746) | 22,218 | (4,128)
Foreign exchange gain (loss) | 5,342 | 2,932 | (9,415) | 8,374
Nonoperating Income (Expense), Total | (4,715) | (14,227) | (18,750) | (28,928)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates | (4,617) | 9,215 | 10,677 | 10,195
Income tax expense (benefit) | (7,923) | 2,088 | 5,577 | 2,835
Income before equity in earnings (losses) of non-consolidated affiliates | 3,306 | 7,127 | 5,100 | 7,360
Equity in earnings (losses) of non-consolidated affiliates | (798) | 206 | (798) | 289
Net income (loss) | 2,508 | 7,333 | 4,302 | 7,649
Net income attributable to the noncontrolling interest | (3,101) | (3,043) | (3,892) | (3,472)
Net income (loss) attributable to MDC Partners Inc. | (593) | 4,290 | 410 | 4,177
Net income (loss) attributable to MDC Partners Inc. common shareholders | $ (4,102) | $ 775 | $ (6,539) | $ (1,448)
Basic and diluted |  |  |  |
Earnings per share, basic | $ (0.06) | $ 0.01 | $ (0.09) | $ (0.02)
Earnings per share, diluted | $ (0.06) | $ 0.01 | $ (0.09) | $ (0.02)
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Weighted Average Number of Shares Outstanding, Basic | 72,528,455 | 71,915,832 | 72,463,058 | 66,118,749
Weighted Average Number of Shares Outstanding, Diluted | 72,528,455 | 72,024,689 | 72,463,058 | 66,118,749
Series 4 Convertible Preferred Stock [Domain] | Preferred Stock |  |  |  |
Other income (expense): |  |  |  |
Accretion on and net income allocated to convertible preference shares | $ (3,509) | $ (3,515) |  | $ 5,625

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