Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 11,131,313	$ 11,230,450
Same Store [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	9,823,436	9,975,880
Non-Same Store and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,146,811	1,049,029
Corporate assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 161,066	$ 205,541