Notes Receivable and Allowance for Losses Summary Of Activity Related To Allowance For Losses (Details) (USD $)			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Forgivable Notes Receivable [Member]		Sep. 30, 2013 Mezzanine & Other Notes Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, December 31, 2012	$ 11,798,000	$ 10,550,000	$ 1,623,000		$ 8,927,000
Provisions			598,000		969,000
Recoveries			(25,000)		0
Write-offs			(147,000)		0
Other			(147,000)	[1]	0	[1]
Balance, June 30, 2013	$ 11,798,000	$ 10,550,000	$ 1,902,000		$ 9,896,000

[1] Consists of default rate assumption changes