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Business Segments Revenues from External Customers for Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from External Customer [Line Items]
Real estate revenue	$ 58	$ 7,925	$ 2,551	$ 7,944
Leasing operations	3,472	3,200	6,781	6,280
Revenues	3,530	11,125	9,332	14,224
Real estate operations
Revenue from External Customer [Line Items]
Real estate revenue	58	7,925	2,551	7,944
Real Estate Operations | Developed Property
Revenue from External Customer [Line Items]
Real estate revenue	0	2,382	2,493	2,382
Real Estate Operations | Undeveloped Property
Revenue from External Customer [Line Items]
Real estate revenue	0	5,444	0	5,444
Real Estate Operations | Commissions and other
Revenue from External Customer [Line Items]
Real estate revenue	58	99	58	118
Leasing Operations
Revenue from External Customer [Line Items]
Leasing operations	$ 3,472	$ 3,200	$ 6,781	$ 6,280

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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