Notes Receivable and Allowance for Losses Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 category	Mar. 31, 2014	Dec. 31, 2014
Notes Receivable and Allowance for Losses [Line Items]
Number of categories, credit losses for notes receivable	2
Notes receivable	$ 59,442,000		$ 50,389,000
Allowance for losses on non-impaired loans	6,695,000		5,987,000
Amortization expense	2,690,000	2,278,000
Forgivable Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	41,558,000		32,379,000
Allowance for losses on non-impaired loans	4,399,000		3,661,000
Amortization expense	1,800,000	1,200,000
Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Notes receivable	17,884,000		18,010,000
Allowance for losses on non-impaired loans	2,296,000		2,326,000
Mezzanine & Other Notes Receivable [Member] | Impaired Loans [Member]
Notes Receivable and Allowance for Losses [Line Items]
Impaired receivables, recorded investment	800,000		800,000
Impaired receivables, related allowance	800,000		800,000
Average notes receivable, nonaccrual status	800,000	12,500,000
Interest income, impaired loans	33,000	54,000
Mezzanine & Other Notes Receivable [Member] | Non-impaired Loans [Member]
Notes Receivable and Allowance for Losses [Line Items]
Allowance for losses on non-impaired loans	$ 1,500,000		$ 1,500,000