Notes Receivable and Allowance for Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Forgivable Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	$ 0	$ 0
More than 90 days Past Due	1,238	1,227
Total Past Due	1,238	1,227
Current	43,122	31,152
Total Notes Receivable	44,360	32,379
Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	0	0
More than 90 days Past Due	47	47
Total Past Due	47	47
Current	15,864	17,963
Total Notes Receivable	15,911	18,010
Mezzanine & Other Notes Receivable [Member] | Senior Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	0	0
More than 90 days Past Due	0	0
Total Past Due	0	0
Current	11,650	10,152
Total Notes Receivable	11,650	10,152
Mezzanine & Other Notes Receivable [Member] | Senior Subordinated Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	0	0
More than 90 days Past Due	0	0
Total Past Due	0	0
Current	466	3,863
Total Notes Receivable	466	3,863
Mezzanine & Other Notes Receivable [Member] | Unsecured Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	0	0
More than 90 days Past Due	47	47
Total Past Due	47	47
Current	3,748	3,948
Total Notes Receivable	$ 3,795	$ 3,995