Fair Value Measurements (Summary Of The Balances Company Has Elected To Account For At Fair Value) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 |
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| Fair Value Measurements | ||
| Other investments | $ 736,757 | $ 787,548 |
| Other secured assets | 14,250 | |
| Other assets and (liabilities) | $ 22,034 | $ 20,000 |
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- Definition Other Assets And Liabilities
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- Definition Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Other investments not otherwise specified in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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