Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,674	$ 1,674
Total intangible assets	257,649	145,883
In-place leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	202,760	105,964
Accumulated amortization	163,867	125,130
Above market leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	35,699	20,453
Accumulated amortization	26,487	19,502
Below-market ground leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	17,516	17,792
Accumulated amortization	$ 897	$ 621