Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,674	$ 1,674
Total intangible assets	189,164	257,649
In-place leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	145,290	202,760
Accumulated amortization	212,413	163,867
Above market leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	24,960	35,699
Accumulated amortization	33,548	26,487
Below-market ground leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	17,240	17,516
Accumulated amortization	$ 1,173	$ 897