Intangible Assets and Liabilities - Intangible Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible liabilities, net	$ 65,922	$ 69,846
Below-Market Rents
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(77,525)	(73,612)
Finite-lived intangible liabilities, net	64,307	68,219
Above-Market Ground Lease
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(366)	(354)
Finite-lived intangible liabilities, net	$ 1,615	$ 1,627