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Acquisition and Transition Costs, Special Charges and Intangible Asset Amortization Acquisition and Transition Costs, Special Charges and Intangible Asset Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]    
Acquisition and Transition Costs $ 0 $ 484
Special Charges 0 5,638
Investment Banking [Member]    
Business Acquisition [Line Items]    
Acquisition and Transition Costs 0 484
Special Charges 0 2,290
Amortization of Intangible Assets 3,215 2,944
Investment Management [Member]    
Business Acquisition [Line Items]    
Special Charges 0 3,348
Amortization of Intangible Assets $ 199 $ 938