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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities By Security Type) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value $ 235,234 $ 595,297
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation (2,647) (13,710)
Fixed maturity securities, Greater than 12 months, Market Value 268,451 249,795
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (19,502) (21,763)
Available-for-sale Securities, Market Value, Total 503,685 845,092
Available-for-sale Securities, Gross Unrealized Depreciation, Total (22,149) (35,473)
Fixed Maturity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value 235,234 595,297
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation (2,647) (13,710)
Fixed maturity securities, Greater than 12 months, Market Value 268,438 249,785
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (19,500) (21,758)
Available-for-sale Securities, Market Value, Total 503,672 845,082
Available-for-sale Securities, Gross Unrealized Depreciation, Total (22,147) (35,468)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Greater than 12 months, Market Value 11,543 3,452
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (817) (287)
Available-for-sale Securities, Market Value, Total 11,543 3,452
Available-for-sale Securities, Gross Unrealized Depreciation, Total (817) (287)
US States and Political Subdivisions Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Greater than 12 months, Market Value 5,779 7,518
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (53) (525)
Available-for-sale Securities, Market Value, Total 5,779 7,518
Available-for-sale Securities, Gross Unrealized Depreciation, Total (53) (525)
Corporate Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value 56,805 342,959
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation (411) (8,449)
Fixed maturity securities, Greater than 12 months, Market Value 108,100 75,998
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (5,787) (9,327)
Available-for-sale Securities, Market Value, Total 164,905 418,957
Available-for-sale Securities, Gross Unrealized Depreciation, Total (6,198) (17,776)
Asset-backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value   819
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation   (6)
Available-for-sale Securities, Market Value, Total   819
Available-for-sale Securities, Gross Unrealized Depreciation, Total   (6)
Commercial Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value   9,292
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation   (1,266)
Fixed maturity securities, Greater than 12 months, Market Value 10,332  
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (404)  
Available-for-sale Securities, Market Value, Total 10,332 9,292
Available-for-sale Securities, Gross Unrealized Depreciation, Total (404) (1,266)
Agency Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value 74,338 151,951
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation (354) (1,695)
Fixed maturity securities, Greater than 12 months, Market Value 12,983 7,199
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (187) (67)
Available-for-sale Securities, Market Value, Total 87,321 159,150
Available-for-sale Securities, Gross Unrealized Depreciation, Total (541) (1,762)
Non-agency Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value   41
Fixed maturity securities, Greater than 12 months, Market Value 496 20,693
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (25) (320)
Available-for-sale Securities, Market Value, Total 496 20,734
Available-for-sale Securities, Gross Unrealized Depreciation, Total (25) (320)
Foreign Government Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value 37,667 12,777
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation (592) (269)
Fixed maturity securities, Greater than 12 months, Market Value 38,281 40,743
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (3,584) (2,333)
Available-for-sale Securities, Market Value, Total 75,948 53,520
Available-for-sale Securities, Gross Unrealized Depreciation, Total (4,176) (2,602)
Foreign Corporate Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Less than 12 months, Market Value 66,424 77,458
Fixed maturity securities, Less than 12 months, Gross Unrealized Depreciation (1,290) (2,025)
Fixed maturity securities, Greater than 12 months, Market Value 80,924 94,182
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (8,643) (8,899)
Available-for-sale Securities, Market Value, Total 147,348 171,640
Available-for-sale Securities, Gross Unrealized Depreciation, Total (9,933) (10,924)
Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Greater than 12 months, Market Value 13 10
Fixed maturity securities, Greater than 12 months, Gross Unrealized Depreciation (2) (5)
Available-for-sale Securities, Market Value, Total 13 10
Available-for-sale Securities, Gross Unrealized Depreciation, Total $ (2) $ (5)