Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Other Assets
Lease inducements, net of accumulated amortization of $4,544 and $3,696 in 2012 and 2011, respectively	$ 11,541	$ 12,219
Investment in Verde Realty	5,380	5,868
FF&E and leasehold improvements, net of accumulated depreciation of $18,504 and $17,814 in 2012 and 2011, respectively	4,398	4,736
Loan closing costs, net of accumulated amortization of $2,421 and $4,026 in 2012 and 2011, respectively	3,976	1,435
Prepaid expenses and other assets	2,932	2,168
Predevelopment costs and earnest money	1,958	581
Intangible Assets:
In-place leases, net of accumulated amortization of $5,099 and $2,833 in 2012 and 2011, respectively	22,767	16,144
Goodwill	5,039	5,155	5,155	5,430
Above market leases, net of accumulated amortization of $9,369 and $8,845 in 2012 and 2011, respectively	7,157	4,414
Total Other Assets	$ 65,148	$ 52,720