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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading $ 254,408 $ 254,776
Financials
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 153,099 152,905
Consumer
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 18,302 44,115
Industrial, utilities and energy
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 32,127 25,350
Healthcare
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 15,609 15,340
Basic materials
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 4,026 12,766
Communications and technology
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading $ 31,245 $ 4,300