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Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |
Total assets | $ 11,254,132 | $ 11,194,791
Same Store [Member] |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |
Total assets | 9,910,526 | 10,076,511
Non-Same Store and Other [Member] |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |
Total assets | 1,140,873 | 937,375
Corporate Assets [Member] |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |
Total assets | $ 202,733 | $ 180,905

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. 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