Deferred Costs and Intangibles, Net - Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Amortization of deferred leasing costs, lease intangibles and other	$ 18,648	$ 22,960	$ 24,898
Amortization of above market lease intangibles	$ 2,553	$ 4,025	$ 6,602