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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]        
Acquisition and Transition Costs $ (329) $ 917 $ (329) $ 1,401
Special Charges 0 (139) 0 5,499
Investment Banking [Member]        
Business Acquisition [Line Items]        
Acquisition and Transition Costs (733) 906 (733) 1,390
Special Charges 0 (139) 0 2,151
Amortization of Intangible Assets 2,862 2,940 6,077 5,884
Investment Management [Member]        
Business Acquisition [Line Items]        
Acquisition and Transition Costs 404 11 404 11
Special Charges 0 0 0 3,348
Amortization of Intangible Assets 144 $ 938 $ 343 $ 1,876
Operating Expense [Member]        
Business Acquisition [Line Items]        
Reversal Of Provision $ 733