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Basis of Presentation and Significant Accounting Policies (Notes Receivable and Related Allowance for Credit Losses) (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Basis of Presentation and Significant Accounting Policies    
Notes receivable, gross $ 77,200 $ 77,853
Allowance for credit losses (24,625) (20,877)
Notes receivable, net $ 52,575 $ 56,976