REAL ESTATE OPERATIONS - Subsurface Interests (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) a	Jun. 30, 2021 USD ($) a	Jun. 30, 2022 USD ($) a	Jun. 30, 2021 USD ($) a
Royalty
Subsurface interests
Revenue from contract with customer, including assessed tax	$ 20	$ 20	$ 30	$ 30
Surface land over subsurface interests
Subsurface interests
Area of land (in acres) | a	356,000		356,000
Revenue recognized for cash payments for the release of surface entry rights	$ 90	$ 50	$ 110	$ 60
Real Estate Operations | Subsurface Revenue, Land Sales
Subsurface interests
Area of land sold (in acres) | a	8,332	9,252	13,082	34,500
Revenue from contract with customer, including assessed tax	$ 500	$ 700	$ 900	$ 2,600