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Earnings Per Share | 9 Months Ended
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Sep. 30, 2019
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 September 30, |  | For the Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Basic weighted average number of shares outstanding | 12,825,944 |  |  | 13,269,024 |  |  | 12,940,129 |  |  | 13,252,596 |
Net dilutive effect of share-based awards, treasury method (1) | 1,007,050 |  |  | 871,239 |  |  | 906,010 |  |  | 790,730 |
Diluted weighted average number of shares outstanding | 13,832,994 |  |  | 14,140,263 |  |  | 13,846,139 |  |  | 14,043,326 |
Net income | $ | 3,949 |  |  | $ | 5,071 |  |  | $ | 27,518 |  |  | $ | 20,631 |
Net income per share |  |  |  |  |  |  |
Basic | $ | 0.31 |  |  | $ | 0.38 |  |  | $ | 2.13 |  |  | $ | 1.56 |
Diluted | $ | 0.29 |  |  | $ | 0.36 |  |  | $ | 1.99 |  |  | $ | 1.47 |
(1) | For both the three and nine months ended September 30, 2019, the diluted net income per share computation does not include the anti-dilutive effect of 7,628 shares of Class A Stock granted under share-based compensation arrangements (4,050 shares for both the three and nine months ended September 30, 2018).

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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