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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]        
Acquisition and Transition Costs $ 339 $ 538 $ 10 $ 1,939
Special Charges 0 28,000 0 33,499
Goodwill, Impairment Loss     0 28,000
Investment Banking [Member]        
Business Acquisition [Line Items]        
Acquisition and Transition Costs 41 538 (692) 1,928
Special Charges 0 0 0 2,151
Amortization of Intangible Assets 2,582 4,866 8,659 10,750
Investment Management [Member]        
Business Acquisition [Line Items]        
Acquisition and Transition Costs 298 0 702 11
Special Charges 0 28,000 0 31,348
Amortization of Intangible Assets $ 117 937 460 $ 2,813
Operating Expense [Member]        
Business Acquisition [Line Items]        
Reversal Of Provision     $ 733  
Special Charges [Member]        
Business Acquisition [Line Items]        
Goodwill, Impairment Loss   $ 28,000