Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Details Textuals) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Deferred Leasing Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Fully amortized deferred leasing costs and intangibles	$ 10.4
In-Place Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Fully amortized deferred leasing costs and intangibles	5.0
Below-Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Fully amortized deferred leasing costs and intangibles	$ 3.8