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Basis of Presentation (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Basis Of Presentation |  |
Assets | $ 7,542,706 | $ 6,476,424
Liabilities | 4,997,516 | 3,857,202
VIE, Primary Beneficiary |  |
Basis Of Presentation |  |
Assets | 958,013 | 970,142
Liabilities | $ 694,847 | $ 697,129
Joint Venture |  |
Basis Of Presentation |  |
Noncontrolling interest, ownership percentage by parent | 45.00% |
Ownership percentage | 55.00% |
Joint Venture | Lire Science Building Located In Boston Massachusetts |  |
Basis Of Presentation |  |
Ownership percentage | 55.00% |
Joint Venture | Lire Science Building Located In Boston Massachusetts | Investor |  |
Basis Of Presentation |  |
Noncontrolling interest, ownership percentage by parent | 45.00% |

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