Fee and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fee And Other Income [Line Items]
BMS cleaning fees	$ 18,794	$ 21,741	$ 36,940	$ 44,374
Management and leasing fees	4,604	4,274	9,403	8,466
Lease termination fees	3,199	2,893	5,604	6,640
Other income	7,092	10,322	15,712	19,357
Fee and other income	33,689	39,230	67,659	78,837
Interstate Properties [Member]
Fee And Other Income [Line Items]
Management and leasing fees	$ 128	$ 132	$ 262	$ 271