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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
Mar. 31, 2012
Dec. 31, 2011
Notes Receivable [Line Items]    
Notes receivable, gross $ 78,579 $ 78,834
Allowance for credit losses (44,091) (41,647)
Notes receivable, net $ 34,488 $ 37,187