Real Estate Activity (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 13, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Subsequent Event [Line Items]
Number of properties sold				4	6
Number of outparcels sold				0	1
Proceeds from sale of real estate				$ 25,778	$ 47,857
Gains on sales of properties, net				(1,436)	6,627
Impairment of Real Estate Assets [Abstract]
Impairment charge of real estate		$ 0	$ 25,199	$ 0	$ 38,916
Acquisitions [Abstract]
Number of Land Parcels Purchased				2	1
Payments to Acquire Land				$ 4,300
Payments to Acquire Real Estate					$ 49,900
Number of real estate acquisitions					1
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ (2,097)
Subsequent Event
Subsequent Event [Line Items]
Number of properties sold	1
Proceeds from sale of real estate	$ 8,500
Below-market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					16 years
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					11 years
Finite-lived Intangible Assets Acquired					$ (4,736)
Above-market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					8 years
Finite-lived Intangible Assets Acquired					$ (825)