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Fair Value Measurement Of Assets And Liabilities (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurement Of Assets And Liabilities [Abstract]  
Assets And Liabilities Measured At Fair Value On A Recurring Basis
Change In Level 3 Assets Measured At Fair Value On A Recurring Basis
Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis
Other Fair Value Disclosures
Carrying Amounts And Estimated Fair Values Of Financial Instruments