Business Segments - Capital Additions Related to Segments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Capital additions	$ 179,124	$ 177,802
Same Store [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	51,608	85,280
Redevelopment and Development [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	115,140	78,089
Acquisition and Other Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	$ 12,376	$ 14,433