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Accumulated Other Comprehensive Income (Amounts reclassified out of AOCI) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Net realized investment gains $ 1,030 $ 865 $ 1,057 $ 1,071  
Tax (expense) or benefit 197 (4,177) (422) (4,152)  
Net of Tax 965 (7,306) 556 (6,775) (6,671)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
         
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Net realized investment gains     1,057    
Total before tax     1,057    
Tax (expense) or benefit     (359)    
Net of Tax     $ 698