Derivative and Hedging Activities (Location and Fair Value of Derivative Instruments as Reported in the Consoiidated Balance Sheet) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Total liability derivatives designated as hedging instruments	$ (9,356,000)	$ (22,886,000)
Contingent features [Abstract]
Maximum amount of defaults on any of the hedged entity's indebtedness before the derivative obligation could also be declared in default	1,000,000
Credit Derivative, Recourse Provisions	provisions that state if the Operating Partnership defaults on any of its recourse indebtedness in excess of $50 million, then the derivative obligation could also be declared in default
Interest Rate Contracts Consolidated Subsidiaries [Member] | Deferred Charges And Other Assets [Member]
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Interest rate contract	1,543,000
Interest Rate Contracts Consolidated Subsidiaries [Member] | Accounts Payable and Accrued Liabilities [Member]
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Total liability derivatives designated as hedging instruments	(3,418,000)	(11,865,000)
Interest Rate Contracts Ujvs Member | Investment in UJVs [Member]
Location and fair value of derivative instruments as reported in the Consolidated Balance Sheet [Abstract]
Total liability derivatives designated as hedging instruments	$ (5,938,000)	$ (11,021,000)
Credit Default Option [Member]
Contingent features [Abstract]
Number of Interest Rate Derivatives Held	3