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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized gains on investments $ 27,128 $ (69,529) $ 42,055 $ (55,260)
Fixed maturity investments
        
Gain (Loss) on Investments [Line Items]        
Gross realized gains 12,166 17,548 25,633 51,624
Gross realized losses (2,587) (14,601) (8,151) (19,155)
Net realized gains on fixed maturity investments 9,579 2,947 17,482 32,469
Net unrealized gains (losses) on investments trading 29,918 (95,680) 57,800 (118,743)
Derivatives
        
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized (losses) gains on investments-related derivatives (6,884) 20,510 (17,783) 20,931
Equity investments
        
Gain (Loss) on Investments [Line Items]        
Net unrealized gains (losses) on investments trading (10,619) 2,620 (20,499) (7,552)
Net realized gains on equity investments trading $ 5,134 $ 74 $ 5,055 $ 17,635