Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Schedule Of Significant Inputs And Assumptions Used To Determine Fair Value Of Available-For-Sale Securities) (Details)

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Financial Instruments (Schedule Of Significant Inputs And Assumptions Used To Determine Fair Value Of Available-For-Sale Securities) (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Financial Instruments [Abstract]    
Discount rate for periodic interest payment 1.05% 1.13%
Discount rate for principle repayment 1.79% 1.93%
Liquidity discount 0.90% 0.90%
Credit discounts 2.00% 2.00%
Estimated period (years) 17 17