Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 11,128,704	$ 11,230,450
Same Store [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	9,740,808	9,975,880
Non-Same Store and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,198,693	1,049,029
Corporate assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 189,203	$ 205,541