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Quarterly Information - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 295,881 | $ 234,793 | $ 250,935 | $ 251,770 | $ 243,254 |  | $ 237,814 |  | $ 242,556 |  | $ 234,530 |  | $ 1,033,379 |  | $ 958,154 |  | $ 920,338
Operating Expenses | 260,908 | 228,297 | 233,544 | 235,718 | 227,677 |  | 230,660 |  | 230,039 |  | 224,909 |  | 958,467 |  | 913,285 |  | 900,786
Income (loss) before income taxes from continuing operations | 34,973 | 6,496 | 17,391 | 16,052 | 15,577 |  | 7,154 |  | 12,517 |  | 9,621 |  | 74,912 |  | 44,869 |  | 19,552
Other Income Tax Expense (Benefit), Continuing Operations | 9,538 | 2,547 | 5,016 | 4,858 | 7,316 |  | 2,083 |  | 3,662 |  | 2,916 |  | 21,959 |  | 15,977 |  | (2,134)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  | 52,953 |  | 28,892 |  | 21,686
Net income (loss) attributable to Oppenheimer Holdings Inc. | $ 25,435 | $ 3,949 | $ 12,375 | $ 11,194 | $ 8,261 |  | $ 5,071 |  | $ 8,855 |  | $ 6,705 |  | $ 52,953 |  | $ 28,892 |  | $ 22,816
Income (Loss) from Continuing Operations, Per Basic Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.10 |  | $ 2.18 |  | $ 1.65
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 |  | 0.00 |  | 0.07
Net income per share | $ 1.99 | $ 0.31 | $ 0.95 | $ 0.86 | $ 0.62 |  | $ 0.38 |  | $ 0.67 |  | $ 0.51 |  | 4.10 |  | 2.18 |  | 1.72
Income (Loss) from Continuing Operations, Per Diluted Share |  |  |  |  |  |  |  |  |  |  |  |  | 3.82 |  | 2.05 |  | 1.60
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 |  | 0.00 |  | 0.07
Earnings Per Share, Diluted | 1.83 | 0.29 | 0.89 | 0.81 | 0.59 |  | 0.36 |  | 0.63 |  | 0.48 |  | 3.82 |  | 2.05 |  | $ 1.67
Dividends paid per share | $ 0.12 | 0.12 | 0.11 | 0.11 | 0.11 |  | 0.11 |  | 0.11 |  | 0.11 |  | 0.46 |  | 0.44 |  |
Market price of Class A Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | 31.30 | 27.42 | 28.73 | 33.76 | [1] | 34.15 | [1] | 29.8 | [1] | 29 | [1] | 31.3 | [2] | 34.15 | [1] |
Low |  | $ 26.42 | $ 24.34 | $ 25.25 | $ 23.52 | [1] | $ 27.4 | [1] | $ 24.6 | [1] | $ 25.25 | [1] | $ 24.34 | [2] | $ 23.52 | [1] |
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