Debt of the Company (Parent [Member])	9 Months Ended
Debt of the Company (Parent [Member])	Sep. 30, 2012
Parent [Member]
Debt of the Company	Debt of the Company All of the Company's debt is held directly by the Operating Partnership. The Company guarantees the Operating Partnership's obligations with respect to its unsecured lines of credit which have a total borrowing capacity of $520.0 million. As of September 30, 2012 and December 31, 2011, the Operating Partnership had amounts outstanding on these lines totaling $136.8 million and $357.1 million, respectively. The Company also guarantees the Operating Partnership's unsecured term loan in the amount of $250.0 million as well as its obligation with respect to the mortgage assumed in connection with the acquisition of the outlet center in Ocean City, Maryland in July 2011, which at September 30, 2012 had a balance of $18.3 million including the debt premium.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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