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Investments Net Realized Gains Losses on Invesments, Excluding Other Than Temporary Impairments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Gain (Loss) on Investments [Line Items]        
Other Investments, Net Realized Gain (Loss) $ 10,585 $ (6,076)    
Fixed Maturities [Member]
       
Gain (Loss) on Investments [Line Items]        
Available-for-sale Securities, Gross Realized Gains 13,015 1,018    
Available-for-sale Securities, Gross Realized Losses (2,187) (296)    
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments 10,828 722    
Equity Securities [Member]
       
Gain (Loss) on Investments [Line Items]        
Available-for-sale Securities, Gross Realized Gains 0 562    
Other Investments [Member]
       
Gain (Loss) on Investments [Line Items]        
Gains (Losses) on Sales of Other Real Estate     589 1,445
Losses on Sales of Other Real Estate (466) 0    
Other Investments, Impairment Losses 0 (974)    
Other Investments, Net Realized Gain (Loss) 123 471    
Mortgage Loans on Real Estate [Member]
       
Gain (Loss) on Investments [Line Items]        
Mortgage Loans on Real Estate, Write-down or Reserve, Amount $ (366) $ (7,831)