Notes Receivable and Allowance for Losses Schedule Of Notes Receivable (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Notes Receivable, Related Parties	$ 63,219,000	$ 60,068,000
Allowance for losses on non-impaired loans	3,345,000	2,261,000
Allowance for losses on receivables specifically evaluated for impairment	8,453,000	8,289,000
Total loan reserves	11,798,000	10,550,000
Net carrying value	51,421,000	49,518,000
Current portion, net	14,126,000	14,415,000
Long-term portion, net	37,295,000	35,103,000
Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	19,018,000	16,235,000
Allowance for losses on non-impaired loans	1,902,000	1,623,000
Allowance for losses on receivables specifically evaluated for impairment	0	0
Total loan reserves	1,902,000	1,623,000
Net carrying value	17,116,000	14,612,000
Current portion, net	425,000	420,000
Long-term portion, net	16,691,000	14,192,000
Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	44,201,000	43,833,000
Allowance for losses on non-impaired loans	1,443,000	638,000
Allowance for losses on receivables specifically evaluated for impairment	8,453,000	8,289,000
Total loan reserves	9,896,000	8,927,000
Net carrying value	34,305,000	34,906,000
Current portion, net	13,701,000	13,995,000
Long-term portion, net	20,604,000	20,911,000
Senior Notes [Member]
Notes Receivable, Related Parties	27,548,000	27,549,000
Senior Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	0	0
Senior Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	27,548,000	27,549,000
Senior Subordinated Notes [Member]
Notes Receivable, Related Parties	14,841,000	15,019,000
Senior Subordinated Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	0	0
Senior Subordinated Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	14,841,000	15,019,000
Unsecured Notes [Member]
Notes Receivable, Related Parties	20,830,000	17,500,000
Unsecured Notes [Member] | Forgivable Notes Receivable [Member]
Notes Receivable, Related Parties	19,018,000	16,235,000
Unsecured Notes [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable, Related Parties	$ 1,812,000	$ 1,265,000