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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Unrealized Unrecognized Loss$ 30,311,000 $ 30,311,000 $ 21,557,000
Aggregate unrealized loss position23,462,000[1] 23,462,000[1] 11,572,000[1]
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss6,800,000 6,800,000  
Other-than-temporary credit impairment on the third security2,543,0002,807,0003,342,00017,231,000 
Non-credit impariment in OCI on the third security(150,000)(1,284,000)280,000905,000 
Structured Securities [Member]
     
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss5,900,000 5,900,000  
Commercial Mortgage-backed Securities ("CMBS") [Member]
     
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss3,600,000 3,600,000  
Unrealized unrecognized losses on securities previously impaired3,200,000 3,200,000  
Unrealized unrecognized losses on securities previously impaired number of securities3 3  
Securities with no further impairment2 2  
Commercial Mortgage-backed Securities ("CMBS") [Member] | Previously Impaired Securities With Further Impairment [Member]
     
Other-than-temporary credit impairment on the third security  100,000  
Non-credit impariment in OCI on the third security  600,000  
Equity Securities [Member]
     
Number of securities in an unrealized/unrecognized loss position139 139  
Aggregate unrealized loss position18,004,000[1] 18,004,000[1] 0[1]
Fixed Maturity Securities [Member]
     
Decrease in unrealized/unrecognized losses  9,300,000  
Eighty Percent to Ninety-Nine Percent [Member]
     
Number of securities in an unrealized/unrecognized loss position188 188 193
Unrealized Unrecognized Loss16,142,000 16,142,000 16,310,000
Sixty Percent to Seventy-Nine Percent [Member]
     
Number of securities in an unrealized/unrecognized loss position64 64 2
Unrealized Unrecognized Loss9,554,000 9,554,000 1,125,000
Forty Percent to Fifty-Nine Percent [Member]
     
Number of securities in an unrealized/unrecognized loss position11 11 2
Unrealized Unrecognized Loss2,963,000 2,963,000 2,160,000
Twenty Percent to Thirty-Nine Percent [Member]
     
Number of securities in an unrealized/unrecognized loss position3 3 1
Unrealized Unrecognized Loss1,652,000 1,652,000 986,000
Zero Percent to Nineteen Percent [Member]
     
Number of securities in an unrealized/unrecognized loss position0 0 1
Unrealized Unrecognized Loss$ 0 $ 0 $ 976,000
[1] Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position.