Fee and Other Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fee And Other Income [Line Items]
BMS cleaning fees	$ 18,956	$ 16,664
Signage Revenue	9,318	6,481
Management and leasing fees	6,214	5,253
Lease termination fees	3,793	59,968
Other income	7,647	8,447
Fee and other income	45,928	96,813
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	$ 134	$ 203