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Investment in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)
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6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 12 Months Ended | |||||
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2012
Deer Park [Member]
SquareFeet
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Jun. 30, 2012
Deer Park Warehouse [Member]
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Jun. 30, 2012
Deer Park Warehouse [Member]
SquareFeet
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Dec. 31, 2008
Deer Park Warehouse [Member]
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Jun. 30, 2008
Deer Park Warehouse [Member]
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Jun. 30, 2012
Deer Park Warehouse [Member]
Warehouse Mortgage [Member]
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Jun. 30, 2012
Deer Park Warehouse [Member]
Warehouse Mortgage [Member]
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Jun. 30, 2008
Deer Park Warehouse [Member]
Warehouse Mortgage [Member]
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Sep. 30, 2011
Houston [Member]
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Jun. 30, 2011
Houston [Member]
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Jun. 30, 2012
Houston [Member]
SquareFeet
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Jun. 30, 2011
National Harbor [Member]
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Jun. 30, 2012
National Harbor [Member]
SquareFeet
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Dec. 31, 2011
National Harbor [Member]
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Jun. 30, 2012
RioCan Canda [Member]
SquareFeet
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Jun. 30, 2012
Westgate [Member]
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Jun. 30, 2012
Westgate [Member]
SquareFeet
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Jun. 30, 2011
Cookstown Property [Member]
RioCan Canda [Member]
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Dec. 31, 2011
Cookstown Property [Member]
RioCan Canda [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||
| Joint Venture Formation Date | 6/1/2008 | 6/1/2011 | 5/1/2011 | ||||||||||||||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | $ 3,300,000 | $ 61,200,000 | |||||||||||||||||||
| Equity Method Investment, Ownership Percentage | 33.30% | 33.30% | 33.30% | 50.00% | 50.00% | 50.00% | 58.00% | 58.00% | |||||||||||||
| Debt Instrument, Maturity Date | May 17, 2011 | ||||||||||||||||||||
| Repayments of Long-term Debt | 500,000 | ||||||||||||||||||||
| Debt Instrument, Deferred Interest Rate | Prime + 5.5% | ||||||||||||||||||||
| Debt Instrument, Interest Rate Terms | LIBOR + 1.85% | LIBOR + 1.75% | |||||||||||||||||||
| Number of Outlet Stores | 85 | 80 | 80 | 80 | |||||||||||||||||
| Phase One Square Footage | 350,000 | ||||||||||||||||||||
| Estimated Square Footage of Real Estate Property When Completed | 470,000 | 350,000 | 330,000 | ||||||||||||||||||
| Purchase Price of Land Acquired | 5,600,000 | ||||||||||||||||||||
| Company Portion of Contributed Capital to the Joint Venture | 20,600,000 | 850,000 | 15,100,000 | 18,100,000 | |||||||||||||||||
| Business Acquisition, Effective Date of Acquisition | December 9, 2011 | ||||||||||||||||||||
| Square Footage of Real Estate Property | 741,976 | 29,253 | 0 | 0 | 155,522 | 0 | |||||||||||||||
| Abandoned development costs | 1,300,000 | ||||||||||||||||||||
| Secured Debt | 1,800,000 | 1,800,000 | 2,300,000 | ||||||||||||||||||
| Asset Impairment Charges | 420,000 | ||||||||||||||||||||
| Business Acquisition, Amount of Cash Paid and Debt Assumed | 47,400,000 | ||||||||||||||||||||
| Business Acquisition, Contingent Consideration, Potential Cash Payment | 13,800,000 | ||||||||||||||||||||
| Business Acquisition, Purchase Price Allocation, Liabilities Assumed | 29,600,000 | ||||||||||||||||||||
| Business Acquisition, Debt Assumed, Stated Interest Rate | 5.10% | ||||||||||||||||||||
| Joint Venture Debt | 43,800,000 | 43,800,000 | |||||||||||||||||||
| Company Portion Line of Credit Facility, Maximum Borrowing Capacity | 25,400,000 | 25,400,000 | |||||||||||||||||||
| Equity Method Investments | $ 72,400,000 | $ 28,500,000 | $ 4,100,000 | $ 0 | $ 0 | $ 21,000,000 | $ 900,000 | $ 24,000,000 | $ 18,300,000 | $ 18,300,000 | |||||||||||