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Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Table Text Block] | The following table sets forth a summary of the Company’s consolidated unaudited quarterly results of operations for the years ended December 31, in thousands of dollars, except per share amounts.
| Quarters
| First |  | Second |  | Third |  | Fourth
Revenue: |  |  |  |  |  |  |
2020 | $ | 327,742 |  |  | $ | 259,678 |  |  | $ | 283,423 |  |  | $ | 328,168 |
2019 | $ | 328,791 |  |  | $ | 362,130 |  |  | $ | 342,907 |  |  | $ | 381,975 |
Cost of services sold: |  |  |  |  |  |  |
2020 | $ | 222,693 |  |  | $ | 165,632 |  |  | $ | 172,531 |  |  | $ | 209,043 |
2019 | $ | 237,154 |  |  | $ | 240,749 |  |  | $ | 222,448 |  |  | $ | 260,725 |
Net Income (loss): |  |  |  |  |  |  |
2020 | $ | 1,794 |  |  | $ | 2,508 |  |  | $ | 14,804 |  |  | $ | (226,303) |
2019 | $ | 316 |  |  | $ | 7,333 |  |  | $ | 5,513 |  |  | $ | (2,259) |
Net income (loss) attributable to MDC Partners Inc.: |  |  |  |  |  |  |
2020 | $ | 1,003 |  |  | $ | (593) |  |  | $ | 4,076 |  |  | $ | (233,457) |
2019 | $ | (113) |  |  | $ | 4,290 |  |  | $ | (1,752) |  |  | $ | (7,678) |
Income (loss) per common share: |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |
2020 | $ | (0.03) |  |  | $ | (0.06) |  |  | $ | (0.07) |  |  | $ | (3.23) |
2019 | $ | (0.04) |  |  | $ | 0.01 |  |  | $ | (0.07) |  |  | $ | (0.15) |
Diluted |  |  |  |  |  |  |
2020 | $ | (0.03) |  |  | $ | (0.06) |  |  | $ | (0.07) |  |  | $ | (3.23) |
2019 | $ | (0.04) |  |  | $ | 0.01 |  |  | $ | (0.07) |  |  | $ | (0.15) |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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