Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures Unconsolidated Real Estate Joint Ventures (Details)

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Investments in Unconsolidated Real Estate Joint Ventures Unconsolidated Real Estate Joint Ventures (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Partnership Interest [Member]
Jun. 30, 2012
Houston [Member]
SquareFeet
Jun. 30, 2012
Deer Park Warehouse [Member]
SquareFeet
Jun. 30, 2012
Deer Park [Member]
SquareFeet
Jun. 30, 2012
Wisconsin Dells [Member]
SquareFeet
Jun. 30, 2012
National Harbor [Member]
SquareFeet
Jun. 30, 2012
RioCan Canda [Member]
SquareFeet
Jun. 30, 2012
Westgate [Member]
SquareFeet
Jun. 30, 2012
Other [Member]
SquareFeet
Schedule of Equity Method Investments [Line Items]                      
Equity Method Investment, Ownership Percentage       50.00% 33.30% 33.30% 50.00% 50.00% 50.00% 58.00% 50.00%
Square Footage of Real Estate Property       0 29,253 741,976 265,086 0 155,522 0 0
Equity Method Investments $ 72,400,000 $ 28,500,000 $ 72,400,000 $ 21,000,000 $ 0 $ 4,100,000 $ 3,900,000 $ 900,000 $ 24,000,000 $ 18,300,000 $ 200,000
Joint Venture Debt $ 273,000,000     $ 0 $ 1,800,000 $ 246,900,000 $ 24,300,000 $ 0 $ 0 $ 0 $ 0