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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Securities
Dec. 31, 2012
Securities
Number of securities in an unrealized/unrecognized loss position 557 101
Unrealized Unrecognized Loss $ 52,011,000 $ 2,934,000
Unrealized Unrecognized Losses Period Increase Decrease 49,100,000  
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months 2,900,000 1,700,000
Eighty Percent to Ninety-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 556 100
Unrealized Unrecognized Loss 51,835,000 2,701,000
Sixty Percent to Seventy-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 1 1
Unrealized Unrecognized Loss 176,000 233,000
Forty Percent to Fifty-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 0
Unrealized Unrecognized Loss 0 0
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
10 Year U.S. Treasury Note [Member]
    
Increase of Yield on Note 127