Deferred Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 468,971
Less: accumulated amortization	(201,371)
Deferred costs, net	$ 267,600	$ 239,920