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Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments [Line Items]      
Gross Realized Gains $ 49,400 $ 52,500 $ 338,700
Fixed Maturity Securities [Member]
      
Investments [Line Items]      
Gross Realized Gains 2,675 8,754 1,918
Gross Realized Losses (10,712) (3,812) (8,589)
Net (8,037) 4,942 (6,671)
Equity Securities [Member]
      
Investments [Line Items]      
Gross Realized Gains 41,872 16,793 20,558
Gross Realized Losses (15,847) (15,905) (70,686)
Net 26,025 888 (50,128)
Short-Term Investments [Member]
      
Investments [Line Items]      
Gross Realized Gains 120 64 356
Gross Realized Losses 0 0 (3,902)
Net $ 120 $ 64 $ (3,546)