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Loss per Common Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Loss per Common Share | ## 3. Loss per Common Share The following table sets forth the computation of basic and diluted loss per common share from continuing operations for the years ended December 31:
|  | 2012 |  | 2011 |  | 2010
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Numerator for diluted loss per common share – loss from continuing operations |  | $ | (73,999 | ) |  | $ | (73,120 | ) |  | $ | (177 | )
Net income attributable to the noncontrolling interests |  |  | (6,012 | ) |  |  | (8,387 | ) |  |  | (10,378 | )
Loss attributable to MDC Partners Inc. common shareholders from continuing operations |  |  | (80,011 | ) |  |  | (81,507 | ) |  |  | (10,555 | )
Effect of dilutive securities |  |  | — |  |  |  | — |  |  |  | — |
Numerator for diluted income per common share – loss attributable to MDC Partners Inc. common shareholders from continuing operations |  | $ | (80,011 | ) |  | $ | (81,507 | ) |  | $ | (10,555 | )
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic loss per common share – weighted average common shares |  |  | 30,726,773 |  |  |  | 29,120,373 |  |  |  | 28,161,144 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive potential common shares |  |  | — |  |  |  | — |  |  |  | — |
Denominator for diluted loss per common share – adjusted weighted shares and assumed conversions |  |  | 30,726,773 |  |  |  | 29,120,373 |  |  |  | 28,161,144 |
Basic loss per common share from continuing operations |  | $ | (2.60 | ) |  | $ | (2.80 | ) |  | $ | (0.38 | )
Diluted loss per common share from continuing operations |  | $ | (2.60 | ) |  | $ | (2.80 | ) |  | $ | (0.38 | )
At December 31, 2012, 2011 and 2010, warrants, options and other rights to purchase, 4,077,242, 5,211,668 and 4,665,293 shares of common stock, respectively, were not included in the computation of diluted loss per common share because doing so would have had an antidilutive effect.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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