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Notes Receivable and Allowance or Losses Summary Of Activity Related To Allowance For Losses (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Forgivable Notes Receivable [Member]
Sep. 30, 2012
Mezzanine & Other Notes Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance, December 31, 2011 $ 9,454 $ 9,228 $ 795 $ 8,433
Provisions     292 262
Recoveries     (33) (97)
Write-offs     (214) 0
Other     16 [1] 0 [1]
Balance, September 30, 2012 $ 9,454 $ 9,228 $ 856 $ 8,598
[1] Consists of default rate assumption changes