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Business Changes and Developments Goodwill Associated With Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |  |
Goodwill | $ 218,232 | $ 189,274 |  |
Goodwill, Acquired During Period | 5,476 | 33,039 |  |
Impairment of Goodwill | (28,500) | 0 | $ 0 |
Goodwill, Other Changes | (27,274) |  |  |
Goodwill, Translation Adjustments | (1,473) | (4,081) |  |
Goodwill | 166,461 | 218,232 | 189,274 |
Business Combination, Goodwill [Abstract] |  |  |  |
Goodwill |  |  |  | $ 194,961
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  | (28,500)
Goodwill | 218,232 | 189,274 | 189,274 | 166,461
Investment Banking [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill | 114,007 | 87,028 |  |
Goodwill, Acquired During Period | 5,476 | 33,039 |  |
Impairment of Goodwill | 0 |  |  |
Goodwill, Other Changes | 0 |  |  |
Goodwill, Translation Adjustments | (4,207) | (6,060) |  |
Goodwill | 115,276 | 114,007 | 87,028 |
Business Combination, Goodwill [Abstract] |  |  |  |
Goodwill |  |  |  | 115,276
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  | 0
Goodwill | 114,007 | 87,028 | 87,028 | 115,276
Investment Management [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill | 104,225 | 102,246 |  |
Goodwill, Acquired During Period | 0 | 0 |  |
Impairment of Goodwill | (28,500) |  |  |
Goodwill, Other Changes | (27,274) |  |  |
Goodwill, Translation Adjustments | 2,734 | 1,979 |  |
Goodwill | 51,185 | 104,225 | 102,246 |
Business Combination, Goodwill [Abstract] |  |  |  |
Goodwill |  |  |  | 79,685
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  | (28,500)
Goodwill | $ 104,225 | $ 102,246 | $ 102,246 | $ 51,185

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