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Basis Of Presentation And Significant Accounting Policies (Notes Receivable And Related Allowance For Credit Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Notes Receivable [Line Items]    
Notes receivable, gross $ 78,834 $ 77,853
Allowance for credit losses (41,647) (20,877)
Notes receivable, net $ 37,187 $ 56,976