Notes Receivable and Allowance for Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 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	1,168	1,227
Total Past Due	1,168	1,227
Current	40,390	31,152
Total Notes Receivable	41,558	32,379
Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	3,359	0
More than 90 days Past Due	47	47
Total Past Due	3,406	47
Current	14,478	17,963
Total Notes Receivable	17,884	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	10,152	10,152
Total Notes Receivable	10,152	10,152
Mezzanine & Other Notes Receivable [Member] | Senior Subordinated Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	3,359	0
More than 90 days Past Due	0	0
Total Past Due	3,359	0
Current	485	3,863
Total Notes Receivable	3,844	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	3,841	3,948
Total Notes Receivable	$ 3,888	$ 3,995