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Related Parties Related Parties - Additional Informationl (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]      
Subordinated Borrowings $ 22,550   $ 22,550
Investment Management [Member] | Private Equity Fund [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 2,394 $ 1,213  
Other Assets [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Noncurrent $ 18,797   $ 6,967