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Investments (Fair Value Below Amortized Cost of Gross Unrealized Losses for Fixed Maturity and Equity Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses $ 318,861 $ 133,558
% of Total 100.00% 100.00%
Less than 20%
    
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses 286,594 54,951
% of Total 89.90% 41.20%
20% or more for less than six months
    
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses 6,325 734
% of Total 2.00% 0.50%
20% or more for six months or greater
    
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses $ 25,942 $ 77,873
% of Total 8.10% 58.30%