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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 30,769   $ 26,917  
Alternative Investments [Member]        
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ (1,100)   $ (3,500)  
Investments accounted for under the equity method [Member]        
Schedule of Equity Method Investments [Line Items]        
Net Investment Income   $ 46,600   $ 77,000
Realized gains (losses)   752,500   160,500
Net change in unrealized (depreciation) appreciation   (883,200)   (518,000)
Net income   $ (84,100)   $ (280,500)