Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 11,192,378	$ 11,194,791
Same Store [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	10,006,979	10,076,511
Non-Same Store and Other
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,000,815	937,375
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 184,584	$ 180,905