Deferred Costs and Intangibles, net - Deferred Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred Costs [Abstract]
Acquired lease intangible assets	$ 98,215	$ 107,668
Deferred leasing costs and other	69,617	68,335
Deferred costs and intangibles, gross	167,832	176,003
Less—accumulated amortization	(59,220)	(63,644)
Total	$ 108,612	$ 112,359