Real Estate and Lease Intangibles - Summary of the Effect of the Amortization for Above and Below Market Ground and Retail Lease Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Total amortization of above/below market lease intangibles	$ (1,012)	$ (858)	$ (2,729)	$ (2,566)
Ground Lease [Member] | Property and Maintenance [Member]
Total amortization of above/below market lease intangibles	(1,092)	(1,080)	(3,253)	(3,241)
Retail Lease [Member] | Rental Income [Member]
Total amortization of above/below market lease intangibles	$ 80	$ 222	$ 524	$ 675