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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Securities
Dec. 31, 2011
Securities
Number of securities in an unrealized/unrecognized loss position 101 141
Unrealized Unrecognized Loss $ 2,934,000 $ 10,635,000
Unrealized Unrecognized Losses Period Increase Decrease 7,700,000  
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months 1,700,000 4,900,000
Non-Credit OTTI Charges 900,000 2,100,000
Decline in fair value percentage 5.00% 6.00%
Eighty Percent to Ninety-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 100 140
Unrealized Unrecognized Loss 2,701,000 10,166,000
Sixty Percent to Seventy-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 1 0
Unrealized Unrecognized Loss 233,000 0
Forty Percent to Fifty-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 1
Unrealized Unrecognized Loss 0 469,000
Twenty Percent to Thirty-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 0
Unrealized Unrecognized Loss 0 0
Zero Percent to Nineteen Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 0
Unrealized Unrecognized Loss $ 0 $ 0