Notes Receivable and Allowance for Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Forgivable Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	$ 0	$ 0
90 days Past Due	1,347	0
Total Past Due	1,347	0
Current	23,701	20,625
Total Notes Receivable	25,048	20,625
Mezzanine & Other Notes Receivable [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	1,368	0
90 days Past Due	9,676	9,676
Total Past Due	11,044	9,676
Current	17,007	25,933
Total Notes Receivable	28,051	35,609
Mezzanine & Other Notes Receivable [Member] | Senior Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	0	0
90 days Past Due	0	0
Total Past Due	0	0
Current	10,150	18,052
Total Notes Receivable	10,150	18,052
Mezzanine & Other Notes Receivable [Member] | Senior Subordinated Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	1,368	0
90 days Past Due	9,629	9,629
Total Past Due	10,997	9,629
Current	2,773	4,523
Total Notes Receivable	13,770	14,152
Mezzanine & Other Notes Receivable [Member] | Unsecured Notes [Member]
Notes Receivable and Allowance for Losses [Line Items]
30-89 days Past Due	0	0
90 days Past Due	47	47
Total Past Due	47	47
Current	4,084	3,358
Total Notes Receivable	$ 4,131	$ 3,405