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Quarterly Information - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 243,254 | $ 237,814 | $ 242,556 | $ 234,530 | $ 264,973 |  | $ 226,220 |  | $ 215,884 |  | $ 213,261 |  | $ 958,154 |  | $ 920,338 |  | $ 857,779
Operating Expenses | 227,671 | 230,670 | 230,055 | 224,905 | 248,403 |  | 214,392 |  | 217,521 |  | 220,286 |  | 913,301 |  | 900,602 |  | 879,671
Income (loss) before income taxes from continuing operations | 15,583 | 7,144 | 12,501 | 9,625 | 16,570 |  | 11,828 |  | (1,637) |  | (7,025) |  | 44,853 |  | 19,736 |  | (21,892)
Other Income Tax Expense (Benefit), Continuing Operations | 7,316 | 2,083 | 3,662 | 2,916 | (4,598) |  | 4,425 |  | (274) |  | (1,687) |  | 15,977 |  | (2,134) |  | (12,262)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 8,267 | 5,061 | 8,839 | 6,709 | 21,168 |  | 7,403 |  | (1,363) |  | (5,338) |  | 28,876 |  | 21,870 |  | (9,630)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 0 | 0 | 0 | 0 | 29 |  | 461 |  | 53 |  | 587 |  | 0 |  | 1,130 |  | 10,121
Net income | 8,267 | 5,061 | 8,839 | 6,709 | 21,197 |  | 7,864 |  | (1,310) |  | (4,751) |  | 28,876 |  | 23,000 |  | 491
Less net income (loss) attributable to non-controlling interest, net of tax | 6 | (10) | (16) | 4 | 4 |  | 75 |  | 9 |  | 96 |  | (16) |  | 184 |  | 1,652
Net income (loss) attributable to Oppenheimer Holdings Inc. | $ 8,261 | $ 5,071 | $ 8,855 | $ 6,705 | $ 21,193 |  | $ 7,789 |  | $ (1,319) |  | $ (4,847) |  | $ 28,892 |  | $ 22,816 |  | $ (1,161)
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.62 | $ 0.38 | $ 0.67 | $ 0.51 | $ 1.61 |  | $ 0.56 |  | $ (0.10) |  | $ (0.40) |  | $ 2.18 |  | $ 1.65 |  | $ (0.72)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.03 |  | 0.00 |  | 0.04 |  | 0.00 |  | 0.07 |  | 0.63
Net income (loss) per share | 0.62 | 0.38 | 0.67 | 0.51 | 2 |  | 1 |  | 0 |  | 0 |  | 2.18 |  | 1.72 |  | (0.09)
Income (Loss) from Continuing Operations, Per Diluted Share | 0.59 | 0.36 | 0.63 | 0.48 | 1.54 |  | 0.54 |  | (0.10) |  | (0.40) |  | 2.05 |  | 1.60 |  | (0.72)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.03 |  | 0.00 |  | 0.04 |  | 0.00 |  | 0.07 |  | 0.63
Earnings Per Share, Diluted | 0.59 | 0.36 | 0.63 | 0.48 | 2 |  | 1 |  | 0 |  | 0 |  | 2.05 |  | 1.67 |  | (0.09)
Basic net income per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | 0.11 |  | 0.11 |  | 0.11 |  | 0.11 |  | 0.44 |  | 0.44 |  | $ 440.00
Market price of Class A Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  |  |  | 29 | [1] | 17.70 | [1] | 18.25 | [1] | 19.60 | [1] | 34.15 | [2] | 29 | [1] |
Low |  |  |  |  | $ 17.35 | [1] | $ 15.40 | [1] | $ 15.10 | [1] | $ 15.90 | [1] | $ 23.52 | [2] | $ 15.1 | [1] |
[1] | The price quotations above were obtained from the New York Stock Exchange website.
[2] | The price quotations above were obtained from the New York Stock Exchange website.

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