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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Securities
Dec. 31, 2013
Securities
Schedule of Available-for-sale Securities [Line Items]    
Number Of Securities In An Unrealized/Unrecognized Loss Position 288 557
Unrealized Unrecognized Loss $ 13,325,000 $ 52,011,000
Unrealized Unrecognized Losses Period Improvement 38,700,000  
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss 12,900,000 2,900,000
Percentage Decline in Fair Value Percentage 2.00% 6.00%
Eighty Percent to Ninety-Nine Percent [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Number Of Securities In An Unrealized/Unrecognized Loss Position 288 556
Unrealized Unrecognized Loss 13,325,000 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 50