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Investments In Associated Companies (Schedule Of Summarized Data For Investments In Associated Companies) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments In Associated Companies [Line Items]      
Assets $ 9,263,189 $ 9,350,298 $ 6,762,364
Liabilities 2,849,019 2,386,917  
Noncontrolling interest 3,865 6,623  
Equity Method Associated Companies [Member]
     
Investments In Associated Companies [Line Items]      
Assets 6,849,185 4,190,534  
Liabilities 3,813,236 1,882,116  
Mandatorily redeemable interests 982,057 975,812  
Noncontrolling interest 47,675 17,471  
Total revenues (including securities gains (losses)) 3,823,061 1,124,140 690,156
Income (loss) from continuing operations before extraordinary items 148,661 43,688 (294,741)
Net income (loss) 148,661 43,797 (294,741)
The Company's income (losses) related to associated companies $ 55,920 $ 33,576 $ (40,507)