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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investment [Line Items]    
Equity investments trading $ 393,877 $ 322,098
Financials    
Investment [Line Items]    
Equity investments trading 193,716 222,190
Communications and technology    
Investment [Line Items]    
Equity investments trading 65,833 31,376
Industrial, utilities and energy    
Investment [Line Items]    
Equity investments trading 51,168 28,859
Consumer    
Investment [Line Items]    
Equity investments trading 40,918 19,522
Healthcare    
Investment [Line Items]    
Equity investments trading 36,148 16,582
Basic materials    
Investment [Line Items]    
Equity investments trading $ 6,094 $ 3,569