Business Segments (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Capital additions	$ 303,741	$ 238,256
Same Store [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	121,069	126,140
Redevelopment and Development [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	147,582	98,191
Acquisition [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	22,398	9,731
Other Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital additions	$ 12,692	$ 4,194