Real Estate Intangibles - Summary of Real Estate Intangible Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Rental income related to (above)/below market tenant leases, net	$ 73	$ (333)	$ (82)	$ (684)
Amortization related to in place lease intangibles and lease commissions	$ (28,518)	$ (33,763)	$ (53,423)	$ (66,024)