Notes Receivable And Allowance For Losses Past Due Balances Of Mezzanine And Other Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable 30-89 days Past Due		$ 0
Financing Receivable >90 days Past Due		10,931
Financing Receivable Total Past Due		10,931
Financing Receivable, Current		7,409
Total Receivables		18,340
Notes Receivable
Financing Receivable 30-89 days Past Due	0
Financing Receivable >90 days Past Due	9,773
Financing Receivable Total Past Due	9,773
Financing Receivable, Current	12,119
Total Receivables	21,892
Notes Receivable | Senior Notes [Member]
Financing Receivable 30-89 days Past Due	0	0
Financing Receivable >90 days Past Due	0	0
Financing Receivable Total Past Due	0	0
Financing Receivable, Current	7,900	3,846
Total Receivables	7,900	3,846
Notes Receivable | Senior Subordinated Notes
Financing Receivable 30-89 days Past Due	0	0
Financing Receivable >90 days Past Due	9,773	10,931
Financing Receivable Total Past Due	9,773	10,931
Financing Receivable, Current	4,219	3,563
Total Receivables	$ 13,992	$ 14,494