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Net Realized and Unrealized Investment (Losses) Gains (Details) - Trading securities [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Total net realized and unrealized investment (losses) gains $ (297,479) $ 371,796 $ (160,735)
Fixed maturities and short term investments [Member]      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities 66,296 120,734 118,575
Change in net unrealized investment gains (losses) (276,776) 228,781 (525,787)
Equities      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities 137,609 98,733 75,217
Change in net unrealized investment gains (losses) (187,561) 2,605 118,010
Other invested assets [Member]      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities (33,317) (20,686) 20,497
Change in net unrealized investment gains (losses) 844 (58,180) 56,652
Other realized and unrealized investments gains (losses) [Member]      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net other realized and unrealized investment gains (losses) 1,053 (3,624) (2,107)
Funds Held - Directly Managed [Member]      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities $ (5,627) $ 3,433 $ (21,792)