Fee and Other Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fee And Other Income [Line Items]
BMS cleaning fees	$ 22,467	$ 15,898	$ 63,618	$ 49,071
Signage Revenue	7,698	8,738	25,889	23,566
Management and leasing fees	4,662	7,977	17,027	19,661
Lease termination fees	3,764	20,344	12,102	87,353
Other income	7,820	7,892	23,982	25,872
Fee and other income	46,411	60,849	142,618	205,523
Stop & Shop [Member]
Loss Contingencies [Line Items]
Gain related to litigation settlement				59,599
New York 1290 Avenue Of Americas [Member]
Fee And Other Income [Line Items]
Lease termination fees		19,500		19,500
Interstate Properties [Member]
Fee And Other Income [Line Items]
Management and leasing fees	$ 132	$ 134	$ 397	$ 467