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Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Assets | $ 9,183,288 | $ 8,853,571
Liabilities | 6,534,751 | 6,022,601
Operating Partnership |  |
Variable Interest Entity [Line Items] |  |
Assets | 279,622 | 284,120
Liabilities | 241,870 | 251,241
Operating Partnership | Property, net |  |
Variable Interest Entity [Line Items] |  |
Assets | 251,668 | 254,071
Operating Partnership | Other assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 27,954 | 30,049
Operating Partnership | Mortgage notes payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 219,209 | 219,140
Operating Partnership | Other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 22,661 | $ 32,101

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