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Business Segments - Schedule of Identifiable Net Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Identifiable net assets	$ 731,260	$ 728,485
Operating segments | Industrial and commercial
Segment Reporting Information [Line Items]
Identifiable net assets	62,534	37,527
Operating segments | Mining royalty lands
Segment Reporting Information [Line Items]
Identifiable net assets	47,828	47,527
Operating segments | Development
Segment Reporting Information [Line Items]
Identifiable net assets	149,038	144,832
Operating segments | Multifamily
Segment Reporting Information [Line Items]
Identifiable net assets	333,268	347,172
Cash items
Segment Reporting Information [Line Items]
Identifiable net assets	135,819	149,935
Unallocated corporate assets
Segment Reporting Information [Line Items]
Identifiable net assets	$ 2,773	$ 1,492

X

- Definition

Amount of asset recognized for present right to economic benefit.

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