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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 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]                
Net investment income earned $ 31,182   $ 32,230   $ 61,951   $ 59,147  
Alternative Investments [Member]                
Schedule of Equity Method Investments [Line Items]                
Net investment income earned $ (600)   $ 1,400   $ (1,700)   $ (2,100)  
Investments accounted for under the equity method [Member]                
Schedule of Equity Method Investments [Line Items]                
Net Investment Income   $ (4,600)   $ 8,500   $ 37,000   $ 95,600
Realized gains (losses)   193,200   279,400   981,100   592,500
Net change in unrealized (depreciation) appreciation   (253,900)   (223,400)   (1,236,500)   (866,900)
Net income   $ (65,300)   $ 64,500   $ (218,400)   $ (178,800)