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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading $ 301,714 $ 254,776
Financials
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 199,798 152,905
Consumer
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 18,796 44,115
Industrial, utilities and energy
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 30,347 25,350
Healthcare
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 16,396 15,340
Basic materials
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 4,000 12,766
Communications and technology
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading $ 32,377 $ 4,300