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Investments (Components Of Net Realized Gains, Excluding OTTI Charges) (Details) (USD $)
 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 06, 2009
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Jun. 30, 2009
securities
Mar. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
HTM fixed maturity securities Gains                       $ 4,000 $ 569,000 $ 225,000
HTM fixed maturity securities Losses                   (200,000)   (564,000) (894,000) (1,049,000)
AFS fixed maturity securities Gains                       9,385,000 8,161,000 20,899,000
AFS fixed maturity securities Losses                       (70,000) (7,619,000) (13,889,000)
AFS equity securities Gains                   7,700,000 19,700,000 6,671,000 16,698,000 33,355,000
AFS equity securities Losses                   (8,300,000) 19,100,000 0 (1,156,000) (28,056,000)
Other investments Gains                       0 0 0
Other investments Losses                       0 (5,184,000) (2,039,000)
Total other net realized investment gains   (3,621,000) (2,045,000) 2,146,000 5,760,000 (3,812,000) 57,000 (3,264,000) (64,000)     15,426,000 10,575,000 9,446,000
Total OTTI charges recognized in earnings                       (13,186,000) (17,658,000) (55,416,000)
Total net realized gains (losses)                       2,240,000 (7,083,000) (45,970,000)
Proceeds From Sale Of Available For Sale Securities                       206,500,000 288,500,000 676,000,000
Sale of equity securities, available-for-sale                       60,071,000 98,015,000 137,244,000
Available For Sale Securities Net Realized Gains                   (600,000) (600,000)      
Overall Market Decline 24.00%                          
Decrease Increase In The Parent Market Capitalization 50.00%                          
Equity securities, AFS   157,355,000       69,636,000       31,100,000   157,355,000 69,636,000  
Number Of Held To Maturity Securities Sold During The Period                   1        
Held-to-maturity Securities, Sold Security, at Carrying Value                   6,000,000        
Equity Securities [Member]
                            
Total OTTI charges recognized in earnings                       $ (11,365,000) $ (2,543,000) $ (2,107,000)