Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred Leasing Intangibles included in Total Assets
Total Deferred Leasing Intangibles, Net	$ 38,037	$ 39,718
Total included in Other Liabilities
Below Market Leases	16,567	18,519
Total Deferred Leasing Intangibles, Net	16,567	18,519
In-Place Leases [Member]
Deferred Leasing Intangibles included in Total Assets
Total Deferred Leasing Intangibles, Net	19,587	21,951
Above Market Leases [Member]
Deferred Leasing Intangibles included in Total Assets
Total Deferred Leasing Intangibles, Net	5,888	3,948
Tenant Relationships [Member]
Deferred Leasing Intangibles included in Total Assets
Total Deferred Leasing Intangibles, Net	$ 12,562	$ 13,819