Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 11,242,120	$ 11,194,791
Same Store [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	9,951,452	10,076,511
Non-Same Store and Other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,078,121	937,375
Corporate Assets [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 212,547	$ 180,905