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Fair Value Disclosures (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount $ 40,435,000 $ 79,638,000
Fair Value, Level 2 to level 1 Transfers, Amount 22,224,000 58,979,000
Available-for-sale Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 30,789,000 77,346,000
Fair Value, Level 2 to level 1 Transfers, Amount 11,156,000 55,723,000
Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 14,773,000 0
Fair Value, Level 2 to level 1 Transfers, Amount 4,000 50,238,000
US Treasury and Government [Member] | Available-for-sale Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 0 75,501,000
Fair Value, Level 2 to level 1 Transfers, Amount 11,152,000 0
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 12,794,000 0
Fair Value, Level 2 to level 1 Transfers, Amount 0 5,485,000
Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 3,222,000 1,845,000
Fair Value, Level 2 to level 1 Transfers, Amount 0 0
Equity Securities, Other [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 0 2,290,000
Fair Value, Level 2 to level 1 Transfers, Amount 0 0
Nonredeemable Preferred Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value, Level 1 to level 2 Transfers, Amount 9,646,000 2,000
Fair Value, Level 2 to level 1 Transfers, Amount $ 11,068,000 $ 3,256,000