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Investments (Schedule Of Trading Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities, Amortized Cost $ 6,207,991 $ 5,714,322
Equity securities 367,483 174,976
Other invested assets trading, at fair value 540,409 347,632
Total, Fair Value 907,892 522,608
Total, Original Cost 886,221 492,285
U.S. Government And Government Agencies [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 1,278,265 1,229,720
Trading securities, Amortized Cost 1,263,948 1,219,233
Non-U.S. Government And Government Agencies [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 256,756 120,793
Trading securities, Amortized Cost 251,784 115,969
States, Municipalities And Political Subdivisions [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 133,902 127,436
Trading securities, Amortized Cost 128,633 128,995
Corporate Debt, Financial Institutions [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 1,161,904 1,261,219
Trading securities, Amortized Cost 1,174,308 1,247,895
Corporate Debt, Industrials [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 987,006 627,524
Trading securities, Amortized Cost 974,731 629,360
Corporate Debt, Utilities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 105,564 101,472
Trading securities, Amortized Cost 103,262 101,622
Residential Mortgage-Backed, Non-Agency Residential [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 302,827 371,935
Trading securities, Amortized Cost 314,077 340,545
Residential Mortgage-Backed, Agency Residential [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 1,183,893 1,195,905
Trading securities, Amortized Cost 1,156,913 1,200,430
Commercial Mortgage-Backed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 331,371 184,043
Trading securities, Amortized Cost 326,697 184,380
Asset-Backed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 513,198 549,050
Trading securities, Amortized Cost 513,638 545,893
Total Fixed Maturity Investments, Trading [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed maturity investments, trading 6,254,686 5,769,097
Trading securities, Amortized Cost 6,207,991 5,714,322
Equity Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities, Amortized Cost 356,370 160,513
Equity securities 367,483 174,976
Other Invested Assets [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other invested assets trading, at fair value 540,409 [1] 347,632 [1]
Other invested assets, Original Cost $ 529,851 [1] $ 331,772 [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.