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Net Investment Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income $ 18,255 $ 18,916 $ 36,372 $ 37,936
Investment expenses 610 619 1,322 1,254
Net investment income 17,645 18,297 35,050 36,682
Debt Securities [Member]
       
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income related to fixed maturity securities and short-term investments and cash equivalents 17,280 18,045 34,526 36,289
Equity Securities [Member]
       
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income related to equity securities 947 777 1,783 1,424
Short-term Investments [Member]
       
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income related to fixed maturity securities and short-term investments and cash equivalents $ 28 $ 94 $ 63 $ 223