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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Earnings Per Share | Earnings per share has been calculated as follows: Expressed in thousands of dollars, except share and per share amounts.
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic weighted average number of shares outstanding |  |  | 13,602,205 |  |  |  | 13,638,087 |  |  |  | 13,340,846 |
Net dilutive effect of warrants, treasury method (1) |  |  | — |  |  |  | — |  |  |  | — |
Net dilutive effect of share-based awards, treasury method (2) |  |  | — |  |  |  | 298,646 |  |  |  | 556,415 |
Diluted common shares |  |  | 13,602,205 |  |  |  | 13,936,733 |  |  |  | 13,897,261 |
Net profit (loss), for the year |  | $ | (851 | ) |  | $ | 12,617 |  |  | $ | 40,780 |
Net profit attributable to non-controlling interests |  |  | 2,762 |  |  |  | 2,301 |  |  |  | 2,248 |
Net profit available to Oppenheimer Holdings Inc. stockholders and assumed conversions |  | $ | (3,613 | ) |  | $ | 10,316 |  |  | $ | 38,532 |
Basic earnings per share |  | $ | (0.27 | ) |  | $ | 0.76 |  |  | $ | 2.89 |
Diluted earnings per share |  | $ | (0.27 | ) |  | $ | 0.74 |  |  | $ | 2.77 |
(1) | As part of the consideration for the 2008 acquisition of certain businesses from CIBC World Markets Corp., the Company issued a warrant to CIBC to purchase 1 million shares of Class A Stock of the Company at $48.62 per share exercisable five years from the January 14, 2008 acquisition date. The warrants expire on April 13, 2013. For the years ended December 31, 2012, 2011 and 2010, the effect of the warrants is anti-dilutive.
(2) | The diluted earnings per share computations do not include the antidilutive effect of the following items:
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Number of antidilutive warrants, options and restricted shares, for the year |  |  | 1,936,871 |  |  |  | 1,142,028 |  |  |  | 1,254,279 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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