Notes Receivable and Allowance for Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Forgivable Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	$ 1,191	$ 1,227
Current	42,244	31,152
Total Notes Receivable	43,435	32,379
Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	47	47
Current	39,563	17,963
Total Notes Receivable	39,610	18,010
Mezzanine & Other Notes Receivable [Member] | Senior Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Current	29,700	10,152
Total Notes Receivable	29,700	10,152
Mezzanine & Other Notes Receivable [Member] | Senior Subordinated Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Current	6,215	3,863
Total Notes Receivable	6,215	3,863
Mezzanine & Other Notes Receivable [Member] | Unsecured Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	47	47
Current	3,648	3,948
Total Notes Receivable	3,695	3,995
Financing Receivables, 30 to 89 Days Past Due [Member] | Forgivable Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 89 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 89 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member] | Senior Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 89 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member] | Senior Subordinated Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 89 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member] | Unsecured Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Forgivable Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	1,191	1,227
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	47	47
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member] | Senior Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member] | Senior Subordinated Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mezzanine & Other Notes Receivable [Member] | Unsecured Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
Total Past Due	$ 47	$ 47