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Basis of Presentation (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Basis Of Presentation
Assets	$ 7,179,852	$ 6,476,424
Liabilities	4,674,703	3,857,202
VIE, Primary Beneficiary
Basis Of Presentation
Assets	946,564	970,142
Liabilities	$ 692,489	$ 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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