Intangible Assets - (Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,674	$ 1,674
Total intangible assets	209,434	257,649
In Place Leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	161,129	202,760
Accumulated amortization	205,497	163,867
Above Market Rents
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	29,322	35,699
Accumulated amortization	32,865	26,487
Below Market Ground Lease
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	17,309	17,516
Accumulated amortization	$ 1,104	$ 897