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Investments (Schedule Of Investments In Other Ventures, Under Equity Method) (Details) (USD $)
0 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Tower Hill Companies [Member]
Dec. 31, 2010
Tower Hill Companies [Member]
Jul. 01, 2008
THIG [Member]
Dec. 31, 2011
THIG [Member]
Dec. 31, 2010
THIG [Member]
Dec. 31, 2011
Tower Hill [Member]
Dec. 31, 2010
Tower Hill [Member]
Jan. 07, 2005
Tower Hill [Member]
Dec. 31, 2011
Tower Hill Signature [Member]
Dec. 31, 2010
Tower Hill Signature [Member]
Dec. 31, 2011
Top Layer Re [Member]
Mar. 31, 2011
Top Layer Re [Member]
Dec. 31, 2010
Top Layer Re [Member]
Feb. 28, 2011
Top Layer Re [Member]
Nov. 30, 2010
Top Layer Re [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Schedule of Equity Method Investments [Line Items]                                      
Investment $ 131,875,000 $ 105,875,000 $ 60,500,000 $ 60,000,000 $ 50,000,000 $ 50,000,000 $ 50,000,000 $ 10,000,000 $ 10,000,000   $ 500,000 $ 0 $ 65,375,000   $ 26,875,000   $ 13,100,000 $ 6,000,000 $ 19,000,000
Ownership %         25.00% 25.00% 25.00% 28.60% 28.60% 28.60% 25.00% 0.00% 50.00%   50.00% 50.00% 50.00% 40.00%  
Equity Method Investment, Additional Contribution                         18,000,000 20,500,000 13,800,000        
Intangible Assets, Net (Excluding Goodwill)         40,000,000                            
Goodwill         7,800,000                            
Carrying Value $ 70,714,000 $ 85,603,000 $ 46,818,000 $ 52,586,000   $ 32,645,000 $ 38,431,000 $ 14,173,000 $ 14,155,000   $ 0 $ 0 $ 15,872,000   $ 14,844,000     $ 8,024,000 $ 18,173,000