Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,674	$ 1,674
Total intangible assets	240,286	257,649
In-place Leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	187,870	202,760
Accumulated amortization	178,757	163,867
Above-market Tenant Leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	33,295	35,699
Accumulated amortization	28,892	26,487
Below-market Ground Lease
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	17,447	17,516
Accumulated amortization	$ 966	$ 897