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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
years
securities
Sep. 30, 2010
Dec. 31, 2010
years
Amortized Cost$ 846,656,000 $ 1,199,801,000
Net Unrealized Gains (Losses)6,187,000 14,523,000
Carrying Value852,843,000 1,214,324,000
Unrecognized Holding Gains49,353,000 43,998,000
Unrecognized Holding Losses(811,000) (2,028,000)
Fair Value901,385,000 1,256,294,000
Held To Maturity securities average duration3.1 3.4
Number of held to maturity securities transferred to available-for-sale68  
Securities reclassified from the HTM category to AFS carrying value222,200,000  
Securities reclassified from the HTM category to AFS net unrecognized gain12,400,000  
Redemption and maturities of fixed maturity securities, held-to-maturity138,907,000238,923,000 
U.S. Government and Government Agencies [Member]
   
Amortized Cost  93,411,000
Net Unrealized Gains (Losses)  4,695,000
Carrying Value  98,106,000
Unrecognized Holding Gains  5,023,000
Unrecognized Holding Losses  0
Fair Value  103,129,000
Foreign Government [Member]
   
Amortized Cost5,292,000 5,292,000
Net Unrealized Gains (Losses)311,000 368,000
Carrying Value5,603,000 5,660,000
Unrecognized Holding Gains0 0
Unrecognized Holding Losses(106,000) (30,000)
Fair Value5,497,000 5,630,000
Obligations of States and Political Subdivisions [Member]
   
Amortized Cost729,361,000 874,388,000
Net Unrealized Gains (Losses)15,640,000 22,183,000
Carrying Value745,001,000 896,571,000
Unrecognized Holding Gains33,246,000 16,845,000
Unrecognized Holding Losses(421,000) (1,132,000)
Fair Value777,826,000 912,284,000
Corporate Securities [Member]
   
Amortized Cost67,055,000 76,663,000
Net Unrealized Gains (Losses)(2,541,000) (3,990,000)
Carrying Value64,514,000 72,673,000
Unrecognized Holding Gains7,681,000 9,705,000
Unrecognized Holding Losses0 (313,000)
Fair Value72,195,000 82,065,000
Asset-backed Securities ("ABS") [Member]
   
Amortized Cost8,366,000 12,947,000
Net Unrealized Gains (Losses)(1,588,000) (2,422,000)
Carrying Value6,778,000 10,525,000
Unrecognized Holding Gains1,544,000 1,847,000
Unrecognized Holding Losses(9,000) (444,000)
Fair Value8,313,000 11,928,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
   
Amortized Cost36,450,000 54,909,000[1]
Net Unrealized Gains (Losses)(5,597,000) (7,354,000)[1]
Carrying Value30,853,000 47,555,000[1]
Unrecognized Holding Gains6,868,000 7,483,000[1]
Unrecognized Holding Losses(275,000) (109,000)[1]
Fair Value37,446,000 54,929,000[1]
Government Guaranteed Agency Securities Carrying Value  8,900,000
Residential Mortgage Backed Securities ("RMBS") [Member]
   
Amortized Cost132,000 82,191,000[2]
Net Unrealized Gains (Losses)(38,000) 1,043,000[2]
Carrying Value94,000 83,234,000[2]
Unrecognized Holding Gains14,000 3,095,000[2]
Unrecognized Holding Losses0 0[2]
Fair Value108,000 86,329,000[2]
Government Guaranteed Agency Securities Carrying Value  $ 4,000,000
[1] 1 CMBS includes government guaranteed agency securities with a carrying value $8.9 million at December 31, 2010.
[2] 2 RMBS includes government guaranteed agency securities with a carrying value $4.0 million at December 31, 2010.