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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized (losses) gains on investments $ (41,138) $ (31,097) $ (26,101) $ 10,958
Fixed maturity investments        
Gain (Loss) on Investments [Line Items]        
Gross realized gains 9,160 7,962 39,364 33,595
Gross realized losses (13,720) (2,720) (40,143) (10,871)
Net realized (losses) gains on fixed maturity investments (4,560) 5,242 (779) 22,724
Net unrealized gains (losses) on investments trading 10,208 (36,600) (11,924) 21,200
Derivatives        
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized losses on investments-related derivatives (16,612) (1,868) (1,004) (19,651)
Equity investments        
Gain (Loss) on Investments [Line Items]        
Net unrealized gains (losses) on investments trading (30,060) (1,394) (28,593) (21,893)
Net realized (losses) gains on equity investments trading $ (114) $ 3,523 $ 16,199 $ 8,578