Acquired In-Place Leases and Above/Below Market Leases Increases (Decreases) in Net Income as Result of Amortization of In-Place Leases Above Market Leases and Below Market Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of leases	$ (976)	$ 1,480	$ (5,464)
Amortization of below market leases	4,131	4,230	4,239
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of leases	(4,762)	(2,090)	(8,769)
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of leases	$ (345)	$ (660)	$ (934)