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Investments (Components Of Net Realized Gains, Excluding OTTI Charges) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]                      
HTM fixed maturity securities gains                 $ 194,000 $ 4,000 $ 569,000
HTM fixed maturity securities losses                 (217,000) (564,000) (894,000)
Short term investments realized losses                 (2,000) 0 0
Other investments securities gains                 1,000 0 0
Other investments securities losses                 (400,000) 0 (5,184,000)
Net realized investment gains 5,540,000 (1,088,000) 178,000 4,358,000 (3,621,000) (2,045,000) 2,146,000 5,760,000 13,252,000 15,426,000 10,575,000
Total OTTI charges recognized in earnings                 (4,264,000) (13,186,000) (17,658,000)
Total net realized gains (losses)                 8,988,000 2,240,000 (7,083,000)
Proceeds from Sale of Available-for-sale Securities                 205,300,000 206,500,000 288,500,000
Fixed Maturity Securities [Member]
                      
Schedule of Available-for-sale Securities [Line Items]                      
AFS securities gains                 4,452,000 9,385,000 8,161,000
AFS securities losses                 (472,000) (70,000) (7,619,000)
Equity Securities [Member]
                      
Schedule of Available-for-sale Securities [Line Items]                      
AFS securities gains                 10,901,000 6,671,000 16,698,000
AFS securities losses                 $ (1,205,000) $ 0 $ (1,156,000)