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Investments (OTTI by Asset Type) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
OTTI Losses Gross $ 40 $ (163) $ 297 $ 369
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income (54) (332) (218) (430)
OTTI Losses Recognized in Earnings 94 169 515 799
Equity Securities [Member]
       
OTTI Losses Gross     171  
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income     0  
OTTI Losses Recognized in Earnings     171  
Fixed Maturity Securities [Member]
       
OTTI Losses Gross 40 (163) 126 369
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income (54) (332) (218) (430)
OTTI Losses Recognized in Earnings 94 169 344 799
Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
       
OTTI Losses Gross       17
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income       0
OTTI Losses Recognized in Earnings       17
Fixed Maturity Securities [Member] | Corporate Securities [Member]
       
OTTI Losses Gross       244
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income       0
OTTI Losses Recognized in Earnings       244
Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
       
OTTI Losses Gross 30   62  
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income 0   0  
OTTI Losses Recognized in Earnings 30   62  
Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
       
OTTI Losses Gross   (260) 108 (186)
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income   (402) 0 (658)
OTTI Losses Recognized in Earnings   142 108 472
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
       
OTTI Losses Gross 10 97 (44) 294
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income (54) 70 (218) 228
OTTI Losses Recognized in Earnings $ 64 $ 27 $ 174 $ 66