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Investments (Schedule of Trading Securities) (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Equity securities trading, at fair value $ 393,913 $ 174,976
Hedge funds, fair value 562,267 347,632
Trading Securities 7,157,214 6,291,705
U.S. Government and Government Agencies [Member]
   
Trading Securities, fair value 982,274 1,229,720
Non-U.S. Government and Government Agencies [Member]
   
Trading Securities, fair value 177,529 120,793
States, Municipalities and Political Subdivisions [Member]
   
Trading Securities, fair value 108,256 127,436
Corporate Debt, Financial Institutions [Member]
   
Trading Securities, fair value 1,440,554 1,261,219
Corporate Debt, Industrials [Member]
   
Trading Securities, fair value 772,829 627,524
Corporate Debt, Utilities [Member]
   
Trading Securities, fair value 135,492 101,472
Residential Mortgage-Backed, Non-Agency Residential [Member]
   
Trading Securities, fair value 363,408 371,935
Residential Mortgage-Backed, Agency Residential [Member]
   
Trading Securities, fair value 1,229,647 1,195,905
Commercial Mortgage-Backed [Member]
   
Trading Securities, fair value 311,509 184,043
Asset-Backed [Member]
   
Trading Securities, fair value 679,536 549,050
Total Fixed Maturity Investments, Trading [Member]
   
Trading Securities, fair value 6,201,034 5,769,097
Equity Securities [Member]
   
Equity securities trading, at fair value 393,913 174,976
Hedge Funds [Member]
   
Hedge funds, fair value $ 562,267 [1] $ 347,632 [1]
[1] Within the Company's financial statements and footnotes "hedge funds" include the Company's investments in both hedge funds and private equity funds.