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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 27,299 | $ 0
Revenue: |  |  |  |
Services | $ 379,743 | $ 390,532 | 706,711 | 735,232
Operating expenses: |  |  |  |
Cost of services sold | 253,390 | 267,822 | 496,420 | 505,385
Office and general expenses | 83,878 | 85,563 | 167,757 | 173,403
Depreciation and amortization | 11,703 | 10,766 | 24,078 | 21,664
Other asset impairment | 0 | 0 | 2,317 | 0
Costs and Expenses, Total | 348,971 | 364,151 | 690,572 | 700,452
Operating profit (loss) | 30,772 | 26,381 | 16,139 | 34,780
Other income (expense): |  |  |  |
Other, net | (5,957) | 6,596 | (12,176) | 9,163
Interest expense and finance charges | (17,018) | (15,688) | (33,249) | (32,456)
Interest income | 159 | 178 | 307 | 405
Nonoperating Income (Expense), Total | (22,816) | (8,914) | (45,118) | (22,888)
Loss before income taxes and equity in earnings (losses) of non-consolidated affiliates | 7,956 | 17,467 | (28,979) | 11,892
Income tax expense (benefit) | 1,977 | 4,641 | (6,353) | 8,610
Loss before equity in earnings of non-consolidated affiliates | 5,979 | 12,826 | (22,626) | 3,282
Equity in earnings (losses) of non-consolidated affiliates | (28) | 641 | 58 | 502
Net loss | 5,951 | 13,467 | (22,568) | 3,784
Net income attributable to noncontrolling interests | (2,545) | (2,214) | (3,442) | (3,097)
Net loss attributable to MDC Partners Inc. | 3,406 | 11,253 | (26,010) | 687
Net loss attributable to MDC Partners Inc. common shareholders | 1,133 | 7,960 | (30,105) | (1,730)
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Stock-based compensation | $ 5,603 | $ 5,540 | $ 10,640 | $ 10,490
Earnings Per Share, Basic | $ 0.02 | $ 0.14 | $ (0.53) | $ (0.03)
Earnings Per Share, Diluted | $ 0.02 | $ 0.14 | $ (0.53) | $ (0.03)
Weighted Average Number of Shares Outstanding, Basic | 57,439,823 | 55,332,497 | 56,924,208 | 53,480,144
Cost of services sold |  |  |  |
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Stock-based compensation | $ 4,047 | $ 3,737 | $ 7,394 | $ 7,248
Office and general expenses |  |  |  |
Weighted Average Number of Common Shares Outstanding: |  |  |  |
Stock-based compensation | 1,556 | 1,803 | 3,246 | 3,242
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock |  |  |  |
Other income (expense): |  |  |  |
Accretion on convertible preference shares | $ (2,273) | $ (3,293) | $ (4,095) | $ (2,417)

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