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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
Mar. 31, 2014
Mar. 31, 2013
Gain (Loss) on Investments [Line Items]    
Net realized and unrealized gains on investments $ 14,927 $ 14,269
Fixed maturity investments
    
Gain (Loss) on Investments [Line Items]    
Gross realized gains 13,467 34,076
Gross realized losses (5,564) (4,554)
Net realized gains on fixed maturity investments 7,903 29,522
Net unrealized gains (losses) on investments 27,882 (23,063)
Derivatives
    
Gain (Loss) on Investments [Line Items]    
Net realized and unrealized gains (losses) on investments-related derivatives (10,899) 421
Equity investments
    
Gain (Loss) on Investments [Line Items]    
Net unrealized gains (losses) on investments (9,880) (10,172)
Net realized gains on equity investments trading $ (79) $ 17,561