Fee and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fee And Other Income [Line Items]
BMS cleaning fees	$ 21,996	$ 18,146
Management and leasing fees	4,637	4,799
Lease termination fees	4,166	2,405
Other income	8,561	8,620
Fee and other income	39,360	33,970
Management fee income from Interstate Properties	$ 128	$ 134