REAL ESTATE OPERATIONS - Subsurface Interests (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) a	Sep. 30, 2022 USD ($) a	Sep. 30, 2023 USD ($) a	Sep. 30, 2022 USD ($) a
Royalty
Subsurface interests
Revenue from contract with customer, including assessed tax		$ 0.7	$ 1.6
Surface land over subsurface interests
Subsurface interests
Area of land (in acres) | a	352,000		352,000
Revenue recognized for cash payments for the release of surface entry rights			$ 0.5	$ 0.2
Real Estate Operations | Subsurface Revenue, Land Sales
Subsurface interests
Area of land sold (in acres) | a	465	1,500	3,481	14,582
Revenue from contract with customer, including assessed tax	$ 0.6		$ 1.0