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Loss per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Numerator |  |  |  |  |  |  |  |  |  |  |
Numerator for basic loss per common share - loss from continuing operations | $ (91,774) | $ (11,901) | $ 12,651 | $ (39,994) | $ (21,860) | $ (11,897) | $ (15,229) | $ (22,909) | $ (131,018) | $ (71,895) | $ (74,163)
Net income attributable to the non-controlling interests |  |  |  |  |  |  |  |  | (6,461) | (6,863) | (8,429)
Loss attributable to MDC Partners Inc. common shareholders from continuing operations |  |  |  |  |  |  |  |  | (137,479) | (78,758) | (82,592)
Effect of dilutive securities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Numerator for diluted loss per common share - loss attributable to MDC Partners Inc. common shareholders from continuing operations |  |  |  |  |  |  |  |  | $ (137,479) | $ (78,758) | $ (82,592)
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic loss per common share - adjusted weighted shares (in shares) |  |  |  |  |  |  |  |  | 47,108,406 | 46,090,159 | 43,680,560
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Denominator for diluted loss per common share - adjusted weighted shares and assumed conversions (in shares) |  |  |  |  |  |  |  |  | 47,108,406 | 46,090,159 | 43,680,560
Basic and diluted loss per common share from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ (2.92) | $ (1.71) | $ (1.89)

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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