Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Assets
Total other assets	$ 68,649	$ 76,285
Leasing commissions, net of accumulated amortization [Member]
Other Assets
Total other assets	18,006	18,207
Acquired above market leases, net
Other Assets
Total other assets	14,148	16,771
Acquired in-place leases, net [Member]
Other Assets
Total other assets	26,984	28,888
Lease incentives, net of accumulated amortization [Member]
Other Assets
Total other assets	1,665	1,850
Other intangible assets, net of accumulated amortization [Member]
Other Assets
Total other assets	740	987
Debt issuance costs, net of accumulated amortization [Member]
Other Assets
Total other assets	3,809	3,392
Purchase deposit [Member]
Other Assets
Total other assets		3,000
Prepaid expenses, deposits, and other [Member]
Other Assets
Total other assets	$ 3,297	$ 3,190