Deferred Leasing Costs and Acquisition-related Intangibles Assets and Liabilities, net (Details Textuals) (USD $) In Millions	Jun. 30, 2011
Deferred Leasing Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Fully amortized deferred leasing costs and intangibles	$ 10.4
Leases Acquired In Place [Member]
Finite-Lived Intangible Assets [Line Items]
Fully amortized deferred leasing costs and intangibles	5.0
Leases Acquired In Place Below Market Adjustment [Member]
Finite-Lived Intangible Assets [Line Items]
Fully amortized deferred leasing costs and intangibles	$ 3.8