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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Derivative Asset, Total$ 34,869$ 74,714
Derivative Liabilities, Total32,14918,917
Derivative Assets [Member] | Other Assets [Member]
  
Interest rate futures2462,459
Foreign currency forward contracts 6,341[1]
Foreign currency forward contracts9,820[2] 
Foreign currency forward contracts948[3] 
Platinum warrant 44,925
Credit default swaps 3,064
Energy and weather contracts23,855[4]17,925[4]
Derivative Liabilities [Member] | Other Liabilities [Member]
  
Interest rate futures1,019719
Foreign currency forward contracts9,281[1] 
Foreign currency forward contracts 3,141[2]
Foreign currency forward contracts 44[3]
Credit default swaps537 
Energy and weather contracts$ 21,312[4]$ 15,013[4]
[1]Contracts used to manage foreign currency risks in underwriting operations.
[2]Contracts used to manage foreign currency risks in investment operations.
[3]Contracts used to manage foreign currency risks in energy and risk operations.
[4]Included in other assets is $28.0 million of derivative assets and $4.2 million of derivative liabilities at September 30, 2011 (December 31, 2010 - $21.7 million and $3.7 million, respectively). Included in other liabilities is $10.8 million of derivative assets and $32.1 million of derivative liabilities at September 30, 2011 (December 31, 2010 - $9.9 million and $24.9 million, respectively).