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Basis Of Presentation And Significant Accounting Policies (Notes Receivable And Related Allowance For Credit Losses) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Basis Of Presentation And Significant Accounting Policies [Abstract]  
Notes receivable, gross$ 77,968$ 77,853
Allowance for credit losses(40,960)(20,877)
Notes receivable, net$ 37,008$ 56,976