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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 28, 2022	Dec. 31, 2021	Dec. 30, 2021	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Losses on equity securities, net	$ (2,674)	$ (14,755)	$ (21,384)	$ (26,943)
Corporate Joint Venture | Seaport Innovation LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment ownership percentage	10.00%		10.00%		20.00%	20.00%	55.00%	55.00%
Holding period			10 years
Corporate Joint Venture | Seaport Innovation LLC | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0558		0.0558
Corporate Joint Venture | Seaport Innovation LLC | Measurement Input, Market Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0525		0.0525
Corporate Joint Venture | The LSMD Fund REIT LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment ownership percentage	20.00%		20.00%
Holding period			10 years
Corporate Joint Venture | The LSMD Fund REIT LLC | Measurement Input, Discount Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0560		0.0560
Corporate Joint Venture | The LSMD Fund REIT LLC | Measurement Input, Discount Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0800		0.0800
Corporate Joint Venture | The LSMD Fund REIT LLC | Measurement Input, Market Capitalization Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0510		0.0510
Corporate Joint Venture | The LSMD Fund REIT LLC | Measurement Input, Market Capitalization Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0625		0.0625
Recurring | Level 1 | Carrying Amount | AlerisLife Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value	$ 10,156		$ 10,156			$ 31,540
Equity securities investment (in shares)	10,691,658		10,691,658
Recurring | Level 1 | Estimated Fair Value | AlerisLife Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value	$ 10,156		$ 10,156			31,540
Recurring | Level 3 | Joint Venture | Carrying Amount | Seaport Innovation LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value	108,395		108,395			215,127
Recurring | Level 3 | Joint Venture | Carrying Amount | The LSMD Fund REIT LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value	51,081		51,081			0
Recurring | Level 3 | Joint Venture | Estimated Fair Value | Seaport Innovation LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value	108,395		108,395			215,127
Recurring | Level 3 | Joint Venture | Estimated Fair Value | The LSMD Fund REIT LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value	$ 51,081		$ 51,081			$ 0

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