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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 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]                
Net investment income earned $ 33,375   $ 32,061   $ 95,326   $ 91,208  
Alternative Investments [Member]                
Schedule of Equity Method Investments [Line Items]                
Net investment income earned $ 1,600   $ 1,300   $ 0   $ (800)  
Investments accounted for under the equity method [Member]                
Schedule of Equity Method Investments [Line Items]                
Net investment (loss) income   $ (55,400)   $ 44,100   $ 26,100   $ 139,600
Realized gains   245,600   385,200   1,186,800   977,700
Net change in unrealized depreciation   117,800   (222,200)   (1,132,800)   (1,089,000)
Net gain   $ 308,000   $ 207,100   $ 80,100   $ 28,300