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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Securities
Dec. 31, 2013
Securities
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in an unrealized/unrecognized loss position 466 557
Unrealized Unrecognized Loss $ 31,395,000 $ 52,011,000
Unrealized Unrecognized Losses Period Improvement 20,600,000  
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months 2,700,000 2,900,000
Eighty Percent to Ninety-Nine Percent [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in an unrealized/unrecognized loss position 466 556
Unrealized Unrecognized Loss 31,395,000 51,835,000
Sixty Percent to Seventy-Nine Percent [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in an unrealized/unrecognized loss position 0 1
Unrealized Unrecognized Loss 0 176,000
Forty Percent to Fifty-Nine Percent [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in an unrealized/unrecognized loss position 0 0
Unrealized Unrecognized Loss 0 0
Twenty Percent to Thirty-Nine Percent [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in an unrealized/unrecognized loss position 0 0
Unrealized Unrecognized Loss 0 0
Zero Percent to Nineteen Percent [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in an unrealized/unrecognized loss position 0 0
Unrealized Unrecognized Loss $ 0 $ 0
10 year U.S. Treasury Note [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Decrease of Yield on 10-year U.S. Treasury Note 31