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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue: |  |  |
Services | $ 1,415,803 | $ 1,476,203 | $ 1,513,779
Operating expenses: |  |  |
Cost of services sold | 961,076 | 991,198 | 1,023,476
Office and general expenses | 328,339 | 349,056 | 310,455
Depreciation and amortization | 38,329 | 46,196 | 43,474
Goodwill and other asset impairment | 7,819 | 80,057 | 4,415
Costs and Expenses, Total | 1,335,563 | 1,466,507 | 1,381,820
Operating income | 80,240 | 9,696 | 131,959
Other income (expense): |  |  |
Interest expense and finance charges, net | (64,942) | (67,075) |
Interest Expense, Other |  |  | 64,364
Other, net | (2,401) | 230 | 1,346
Foreign exchange gain (loss) | 8,750 | (23,258) | 18,137
Nonoperating Income (Expense), Total | (58,593) | (90,103) | (44,881)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates | 21,647 | (80,407) | 87,078
Income tax expense (benefit) | 10,533 | 31,603 | (168,064)
Income (loss) before equity in earnings of non-consolidated affiliates | 11,114 | (112,010) | 255,142
Equity in earnings of non-consolidated affiliates | 352 | 62 | 2,081
Net income (loss) | 11,466 | (111,948) | 257,223
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  | 257,223
Net income attributable to the noncontrolling interest | (16,156) | (11,785) | (15,375)
Net income (loss) attributable to MDC Partners Inc. | (4,690) | (123,733) | 241,848
Net income (loss) attributable to MDC Partners Inc. common shareholders | $ (16,994) | $ (132,088) | $ 205,594
Basic and diluted |  |  |
Earnings per share, basic | $ (0.25) | $ (2.31) | $ 3.72
Earnings per share, diluted | $ (0.25) | $ (2.31) | $ 3.71
Weighted Average Number of Common Shares Outstanding: |  |  |
Weighted Average Number of Shares Outstanding, Basic | 69,132,100 | 57,218,994 | 55,255,797
Weighted Average Number of Shares Outstanding, Diluted | 69,132,100 | 57,218,994 | 55,481,786
Stock-based compensation | $ 31,040 | $ 18,416 | $ 24,350
Cost of services sold |  |  |
Weighted Average Number of Common Shares Outstanding: |  |  |
Stock-based compensation | 29,160 | 12,513 | 19,015
Office and general expenses |  |  |
Weighted Average Number of Common Shares Outstanding: |  |  |
Stock-based compensation | $ 1,880 | 5,903 | 5,335
Series 4 Convertible Preferred Stock [Domain] | Convertible Preference Shares |  |  |
Other income (expense): |  |  |
Accretion on and net income allocated to convertible preference shares |  | $ 8,355 | $ 36,254

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