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Earnings Per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings per share Basic earnings per share is computed by dividing net income attributable to Oppenheimer Holdings Inc. by the weighted average number of shares of Class A non-voting common stock ("Class A Stock") and Class B voting common stock ("Class B Stock") outstanding. Diluted earnings per share includes the weighted average number of shares of Class A Stock and Class B Stock outstanding and options to purchase Class A Stock and unvested restricted stock awards of Class A Stock using the treasury stock method. Earnings per share have been calculated as follows:
(Expressed in thousands, except number of shares and per share amounts) |  |  |
| For the Three Months Ended March 31,
| 2018 |  | 2017
Basic weighted average number of shares outstanding | 13,239,628 |  |  | 13,399,250 |
Net dilutive effect of share-based awards, treasury method (1) | 737,864 |  |  | — |
Diluted weighted average number of shares outstanding | 13,977,492 |  |  | 13,399,250 |
Net income (loss) from continuing operations | $ | 6,709 |  |  | $ | (5,338 | )
Net income from discontinued operations | — |  |  | 587 |
Net income (loss) | 6,709 |  |  | (4,751 | )
Less net income attributable to non-controlling interest, net of tax | 4 |  |  | 96 |
Net income (loss) attributable to Oppenheimer Holdings Inc. | $ | 6,705 |  |  | $ | (4,847 | )
Basic net income (loss) per share attributable to Oppenheimer Holdings Inc. |  |  |
Continuing operations | $ | 0.51 |  |  | $ | (0.40 | )
Discontinued operations (2) | — |  |  | 0.04 |
Net income (loss) per share | $ | 0.51 |  |  | $ | (0.36 | )
Diluted net income (loss) per share attributable to Oppenheimer Holdings Inc. |  |  |
Continuing operations | $ | 0.48 |  |  | $ | (0.40 | )
Discontinued operations (2) | — |  |  | 0.04 |
Net income (loss) per share | $ | 0.48 |  |  | $ | (0.36 | )
(1) | For the three months ended March 31, 2018, the diluted earnings per share computation does not include the anti-dilutive effect of 4,050 shares of Class A Stock granted under share-based compensation arrangements (1,334,607 shares for the three months ended March 31, 2017 ).
(2) | Represents net income from discontinued operations less net income attributable to non-controlling interest, net of tax divided by weighted average number of shares outstanding.

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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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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