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Investments in Equity Method Affiliates (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]      
Incentive fee revenue   $ 1,720 $ 4,359
Earnings / (loss) realized 1,828 5,052 6,232
Deep Value GP [Member]
     
Schedule of Equity Method Investments [Line Items]      
Incentive fee revenue     8,719
Ownership percentage of equity method affiliate 50.00%   50.00%
Earnings / (loss) realized   (14) 4,349
Deep Value GP II [Member]
     
Schedule of Equity Method Investments [Line Items]      
Incentive fee revenue   4,301  
Ownership percentage of equity method affiliate 40.00% 40.00%  
Earnings / (loss) realized $ (13) $ 1,726 $ 2
Star Asia Manager [Member]
     
Schedule of Equity Method Investments [Line Items]      
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 100.00%