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Noncontrolling Interest (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($)
Noncontrolling Interest
Net income attributable to noncontrolling interest	$ 1,339	$ 1,100	$ 4,238	$ 3,838
Cash distribution for joint venture partners	5,524	$ 5,324	16,848	$ 16,707
Variable interest entity, consolidated, carrying amount, real estate assets	690,382		690,382
Variable interest entity, consolidated, carrying amount, mortgage debt	$ 620,000		$ 620,000
Joint Venture
Noncontrolling Interest
Ownership percentage by noncontrolling owners	45.00%		45.00%
Ownership percentage	55.00%		55.00%
Boston, MA | Life Science Building | Joint Venture
Noncontrolling Interest
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