v2.4.0.6
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, 2013
Mar. 31, 2012
Gain (Loss) on Investments [Line Items]    
Net realized and unrealized gains on investments $ 13,850 $ 46,113
Total other-than-temporary impairments 0 (161)
Portion recognized in other comprehensive income, before taxes 0 27
Net other-than-temporary impairments 0 (134)
Fixed maturity investments [Member]
   
Gain (Loss) on Investments [Line Items]    
Gross realized gains 34,080 36,286
Gross realized losses (4,554) (6,950)
Net realized gains (losses) on fixed maturity investments 29,526 29,336
Net unrealized gains (losses) on investments (23,065) 14,257
Equity investments [Member]
   
Gain (Loss) on Investments [Line Items]    
Net unrealized gains (losses) on investments (10,172) 2,520
Net realized gains on equity investments trading $ 17,561 $ 0