Notes Receivable and Allowance for Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	$ 1,822,000	$ 1,161,000
Current	49,579,000	43,172,000
Total Notes Receivable	51,401,000	44,333,000
Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	6,056,000	0
Current	56,451,000	50,111,000
Total Notes Receivable	62,507,000	50,111,000
Mezzanine & Other Notes Receivable | Senior
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	6,056,000	0
Current	46,120,000	40,388,000
Total Notes Receivable	52,176,000	40,388,000
Mezzanine & Other Notes Receivable | Subordinated
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Current	6,416,000	6,197,000
Total Notes Receivable	6,416,000	6,197,000
Mezzanine & Other Notes Receivable | Unsecured
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Current	3,915,000	3,526,000
Total Notes Receivable	3,915,000	3,526,000
Financing Receivables, 30 to 89 Days Past Due | Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 89 Days Past Due | Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	6,056,000	0
Financing Receivables, 30 to 89 Days Past Due | Mezzanine & Other Notes Receivable | Senior
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	6,056,000	0
Financing Receivables, 30 to 89 Days Past Due | Mezzanine & Other Notes Receivable | Subordinated
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 89 Days Past Due | Mezzanine & Other Notes Receivable | Unsecured
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Forgivable Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	1,822,000	1,161,000
Financing Receivables, Equal to Greater than 90 Days Past Due | Mezzanine & Other Notes Receivable
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Mezzanine & Other Notes Receivable | Senior
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Mezzanine & Other Notes Receivable | Subordinated
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Mezzanine & Other Notes Receivable | Unsecured
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	$ 0	$ 0