Impairments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) ft²	Mar. 31, 2019 USD ($) ft²
Real Estate Properties [Line Items]
GLA | ft²	50,910	158,565
Impairment Charge | $	$ 4,598	$ 3,112
Spring Mall
Real Estate Properties [Line Items]
GLA | ft²	45,920
Impairment Charge | $	$ 4,584
Parcel at Lakes Crossing
Real Estate Properties [Line Items]
GLA | ft²	4,990
Impairment Charge | $	$ 14
Brice Park
Real Estate Properties [Line Items]
GLA | ft²		158,565
Impairment Charge | $		$ 3,112