Business Segments - Capital Additions Related to Segments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Capital additions	$ 260,724	$ 300,337
Same Store [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	73,681	130,967
Redevelopment and Development [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	168,247	144,210
Acquisition and Other Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	$ 18,796	$ 25,160