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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading $ 493,056 $ 322,098
Financials    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 228,777 222,190
Communications and technology    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 84,522 31,376
Industrial, utilities and energy    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 71,168 28,859
Consumer    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 50,764 19,522
Healthcare    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading 48,572 16,582
Basic materials    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity investments trading $ 9,253 $ 3,569