Notes Receivable and Allowance for Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) (Mezzanine & Other Notes Receivable [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable 30-89 days Past Due	$ 9,500,000	$ 619,000
Financing Receivable >90 days Past Due	10,315,000	9,676,000
Financing Receivable Total Past Due	19,815,000	10,295,000
Financing Receivable, Current	24,386,000	33,538,000
Total Receivables	44,201,000	43,833,000
Senior Notes [Member]
Financing Receivable 30-89 days Past Due	9,500,000	0
Financing Receivable >90 days Past Due	0	0
Financing Receivable Total Past Due	9,500,000	0
Financing Receivable, Current	18,048,000	27,549,000
Total Receivables	27,548,000	27,549,000
Senior Subordinated Notes [Member]
Financing Receivable 30-89 days Past Due	0	619,000
Financing Receivable >90 days Past Due	10,268,000	9,629,000
Financing Receivable Total Past Due	10,268,000	10,248,000
Financing Receivable, Current	4,573,000	4,771,000
Total Receivables	14,841,000	15,019,000
Unsecured Notes [Member]
Financing Receivable 30-89 days Past Due	0	0
Financing Receivable >90 days Past Due	47,000	47,000
Financing Receivable Total Past Due	47,000	47,000
Financing Receivable, Current	1,765,000	1,218,000
Total Receivables	$ 1,812,000	$ 1,265,000