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Notes Receivable and Allowance for Losses Summary Of Activity Related To Allowance For Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Forgivable Notes Receivable [Member]
Mar. 31, 2013
Mezzanine & Other Notes Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance, December 31, 2012 $ 11,286 $ 10,550 $ 1,623 $ 8,927
Provisions     165 664
Recoveries     0 0
Write-offs     (6) 0
Other     (87) [1] 0 [1]
Balance, March 31, 2013 $ 11,286 $ 10,550 $ 1,695 $ 9,591
[1] Consists of default rate assumption changes