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Quarterly Results of Operations - Schedule of Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Services | $ 393,662 | $ 375,830 | $ 379,743 | $ 326,968 | $ 402,747 | $ 375,800 | $ 390,532 | $ 344,700 | $ 1,476,203 | $ 1,513,779 | $ 1,385,785
Cost of services sold | 256,088 | 238,690 | 253,390 | 243,030 | 268,673 | 249,418 | 267,822 | 237,563 | 991,198 | 1,023,476 | 936,133
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | (75,713) | (13,667) | 5,951 | (28,519) | 231,455 | 21,984 | 13,467 | (9,683) | (111,948) | 257,223 | (40,621)
Net income (loss) attributable to MDC Partners Inc. | $ (81,598) | $ (16,125) | $ 3,406 | $ (29,416) | $ 222,668 | $ 18,493 | $ 11,253 | $ (10,566) | $ (123,733) | $ 241,848 | $ (45,839)
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ (2.31) | $ 3.72 | $ (0.89)
Net income (loss) (in dollars per share) | $ (1.46) | $ (0.32) | $ 0.02 | $ (0.56) | $ 3.33 | $ 0.25 | $ 0.14 | $ (0.21) | (2.31) | 3.72 | (0.89)
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | (2.31) | 3.71 | (0.89)
Net income (loss) (in dollars per share) | $ (1.46) | $ (0.32) | $ 0.02 | $ (0.56) | $ 3.30 | $ 0.24 | $ 0.14 | $ (0.21) | $ (2.31) | $ 3.71 | $ (0.89)

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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