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Summary Of Significant Accounting And Reporting Policies (Schedule Of Allowance For Doubtful Accounts) (Details) (Allowance For Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Allowance For Doubtful Accounts [Member]
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning Balance $ 4,300,000 $ 4,500,000
Net Additions/(Reductions) to Costs and Expenses (802,929) (96,236)
Deductions and Other Adjustments (97,071) [1] (103,764) [1]
Ending Balance $ 3,400,000 $ 4,300,000
[1] Represents excess of accounts written off over recoveries and other adjustments.