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Investments (Schedule Of Trading Securities) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Equity securities trading, at fair value$ 424,104$ 174,976
Hedge funds, fair value552,074347,632
Trading Securities7,255,7936,291,705
U.S. Government And Government Agencies [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value1,067,6731,229,720
Non-U.S. Government And Government Agencies [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value225,782120,793
States, Municipalities And Political Subdivisions [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value103,180127,436
Corporate Debt, Financial Institutions [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value1,292,0781,261,219
Corporate Debt, Industrials [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value827,425627,524
Corporate Debt, Utilities [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value115,214101,472
Residential Mortgage-Backed, Non-Agency Residential [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value328,395371,935
Residential Mortgage-Backed, Agency Residential [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value1,374,5641,195,905
Commercial Mortgage-Backed [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value350,704184,043
Asset-Backed [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value594,600549,050
Total Fixed Maturity Investments, Trading [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading Securities, fair value6,279,6155,769,097
Equity Securities [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Equity securities trading, at fair value424,104174,976
Hedge Funds [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Hedge funds, fair value$ 552,074[1]$ 347,632[1]
[1]Within the Company's financial statements and footnotes "other invested assets" include the Company's investments in both hedge funds and private equity funds.