Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 11,230,450	$ 11,323,781
Same Store [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	9,661,935	9,921,270
Non-Same Store and Other
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,362,974	1,233,351
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 205,541	$ 169,160