Real Estate Intangibles (Summary of Real Estate Intangible Amortization Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate Intangible Amortization [Abstract]
Rental income related to (above)/below market tenant leases, net	$ 1,710	$ 508	$ (1,269)
Amortization related to in place lease intangibles and lease commissions	$ (121,004)	$ (135,047)	$ (122,515)