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v2.4.0.6
Investments (Summary Of Investments Classified As AFS) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 4,690,566,000 $ 4,180,376,000
Gross Unrealized Gains 119,248,000 92,236,000
Gross Unrealized Losses 12,764,000 19,357,000
Fair Value 4,797,050,000 4,253,255,000
Tax Exempt Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,812,225,000 2,488,135,000
Gross Unrealized Gains 36,304,000 36,657,000
Gross Unrealized Losses 3,125,000 550,000
Fair Value 2,845,404,000 2,524,242,000
Taxable Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,381,556,000 1,226,136,000
Gross Unrealized Gains 22,109,000 20,015,000
Gross Unrealized Losses 1,283,000 1,514,000
Fair Value 1,402,382,000 1,244,637,000
Restricted Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 170,000,000 170,000,000
Gross Unrealized Gains     
Gross Unrealized Losses 949,000 3,019,000
Fair Value 169,051,000 166,981,000
Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 326,785,000 296,105,000
Gross Unrealized Gains 60,835,000 35,564,000
Gross Unrealized Losses 7,407,000 14,274,000
Fair Value $ 380,213,000 $ 317,395,000