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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue: |  |  |  |
Services | $ 342,907 | $ 375,830 | $ 1,033,828 | $ 1,082,541
Operating expenses: |  |  |  |
Cost of services sold | 222,448 | 238,690 | 700,351 | 735,110
Office and general expenses | 79,726 | 102,380 | 234,120 | 270,137
Depreciation and amortization | 9,368 | 11,134 | 28,869 | 35,212
Goodwill and other asset impairment | 1,944 | 21,008 | 1,944 | 23,325
Costs and Expenses, Total | 313,486 | 373,212 | 965,284 | 1,063,784
Operating income | 29,421 | 2,618 | 68,544 | 18,757
Other income (expense): |  |  |  |
Interest expense and finance charges, net | (16,110) | (17,063) | (49,284) | (50,005)
Other, net | (431) | 189 | (4,559) | 1,222
Foreign exchange gain (loss) | (3,973) | 3,275 | 4,401 | (9,934)
Nonoperating Income (Expense), Total | (20,514) | (13,599) | (49,442) | (58,717)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates | 8,907 | (10,981) | 19,102 | (39,960)
Income tax expense (benefit) | 3,457 | 2,986 | 6,292 | (3,367)
Income (loss) before equity in earnings of non-consolidated affiliates | 5,450 | (13,967) | 12,810 | (36,593)
Equity in earnings of non-consolidated affiliates | 63 | 300 | 352 | 358
Net income (loss) | 5,513 | (13,667) | 13,162 | (36,235)
Net income attributable to the noncontrolling interest | (7,265) | (2,458) | (10,737) | (5,900)
Net income (loss) attributable to MDC Partners Inc. | $ (1,752) | (16,125) | $ 2,425 | $ (42,135)
Accretion on and net income allocated to convertible preference shares |  | $ 2,109 |  |
Basic and diluted |  |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share | $ (0.07) | $ (0.32) | $ (0.10) | $ (0.85)
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Weighted Average Number of Shares Outstanding, Basic | 72,044,480 | 57,498,661 | 68,154,306 | 57,117,797
Weighted Average Number of Shares Outstanding, Diluted | 72,044,480 | 57,498,661 | 68,154,306 | 57,117,797
Stock-based compensation | $ 6,026 | $ 6,242 | $ 12,632 | $ 16,882
Cost of services sold |  |  |  |
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Stock-based compensation | 5,193 | 4,390 | 12,180 | 11,784
Office and general expenses |  |  |  |
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Stock-based compensation | 833 | $ 1,852 | $ 452 | 5,098
Series 4 Convertible Preferred Stock [Domain] | Preferred Stock |  |  |  |
Other income (expense): |  |  |  |
Accretion on and net income allocated to convertible preference shares | $ 3,306 |  |  | $ 6,204

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