Fee and Other Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fee And Other Income [Line Items]
BMS cleaning fees	$ 22,195	$ 16,509	$ 41,151	$ 33,173
Signage Revenue	8,873	8,347	18,191	14,828
Management and leasing fees	6,151	6,431	12,365	11,684
Lease termination fees	4,545	7,041	8,338	67,009
Other income	8,516	9,533	16,163	17,980
Fee and other income	50,280	47,861	96,208	144,674
Stop & Shop [Member]
Loss Contingencies [Line Items]
Gain related to litigation settlement				59,599
Interstate Properties [Member]
Fee And Other Income [Line Items]
Management and leasing fees	$ 131	$ 130	$ 265	$ 333