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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 422,908 | $ 276,259 | $ 264,730 | $ 234,770 | $ 295,881 | $ 234,793 | $ 250,935 | $ 251,770 | $ 1,198,667 | $ 1,033,379 | $ 958,154
Operating Expenses | 309,113 | 254,541 | 241,466 | 224,547 | 260,908 | 228,297 | 233,544 | 235,718 | 1,029,667 | 958,467 | 913,285
Operating Income (Loss) | 113,795 | 21,718 | 23,264 | 10,223 | 34,973 | 6,496 | 17,391 | 16,052 | 169,000 | 74,912 | 44,869
Income Tax Expense (Benefit) | 31,915 | 6,079 | 5,615 | 2,405 | 9,538 | 2,547 | 5,016 | 4,858 | 46,014 | 21,959 | 15,977
Net income (loss) attributable to Oppenheimer Holdings Inc. | $ 81,880 | $ 15,639 | $ 17,649 | $ 7,818 | $ 25,435 | $ 3,949 | $ 12,375 | $ 11,194 | $ 122,986 | $ 52,953 | $ 28,892
Earnings Per Share, Basic | $ 6.56 | $ 1.25 | $ 1.40 | $ 0.61 | $ 1.99 | $ 0.31 | $ 0.95 | $ 0.86 | $ 9.73 | $ 4.10 | $ 2.18
Earnings Per Share, Diluted | 6.17 | 1.19 | 1.34 | 0.58 | 1.83 | 0.29 | 0.89 | 0.81 | 9.30 | 3.82 | $ 2.05
Dividends paid per share | 1.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.11 | 0.11 | 1.48 | 0.46 |
Market price of Class A Stock |  |  |  |  |  |  |  |  |  |  |
High | 33.21 | 26.11 | 24.42 | 28.38 | 29.25 | 31.30 | 27.42 | 28.73 | 33.21 | 31.30 |
Low | $ 22.29 | $ 20.33 | $ 17.20 | $ 14.88 | $ 27.09 | $ 26.42 | $ 24.34 | $ 25.25 | $ 14.88 | $ 24.34 |

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