Fee and Other Income - Schedule of Fee and Other Income (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fee And Other Income [Line Items]
Lease termination income	$ 954	$ 3,460	$ 1,915	$ 14,508
1633 Broadway [Member]
Fee And Other Income [Line Items]
Lease termination income				$ 10,861