REAL ESTATE OPERATIONS - Subsurface Interests (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) a	Jun. 30, 2022 USD ($) a	Jun. 30, 2023 USD ($) a	Jun. 30, 2022 USD ($) a
Royalty
Subsurface interests
Revenue from contract with customer, including assessed tax		$ 0.5	$ 0.9
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			$ 0.2	$ 0.1
Real Estate Operations | Subsurface Revenue, Land Sales
Subsurface interests
Area of land sold (in acres) | a	604	8,332	3,016	13,082
Revenue from contract with customer, including assessed tax	$ 0.1		$ 0.4