Intangibles - Schedule of Intangible Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Intangibles [Abstract]
Below market lease intangibles	$ 123,883	$ 161,595
Above market ground lease intangibles	2,329	2,329
Gross intangible lease liabilities	126,212	163,924
Accumulated depreciation and amortization	(73,633)	(105,779)
Net intangible lease liabilities	$ 52,579	$ 58,145