Business Segments - Capital Additions Related to Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Capital additions	$ 93,884	$ 75,390
Same Store [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	27,526	35,379
Redevelopment and Development [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	44,596	36,458
Acquisition [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	15,343	76
Other Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	$ 6,419	$ 3,477