REAL ESTATE OPERATIONS - Subsurface Interests (Details) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2021 USD ($) a	Dec. 31, 2020 USD ($) a	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) a
Subsurface interests
Area of land (in acres) | a	84,900	345		84,900
Revenue from contract with customer, including assessed tax	$ 13,427	$ 650	$ 852
Lease revenue	50,679	49,953	41,956
Subsurface Revenue - Other
Subsurface interests
Revenue from contract with customer, including assessed tax	$ 4,724	638	150
Royalty
Subsurface interests
Area of land (in acres) | a	800			800
Revenue from contract with customer, including assessed tax				$ 100
Subsurface Revenue, Lease
Subsurface interests
Lease revenue			598
Subsurface Interests
Subsurface interests
Revenue from contract with customer, including assessed tax		400	0
Surface land over subsurface interests
Subsurface interests
Area of land (in acres) | a	370,000			370,000
Revenue recognized for cash payments for the release of surface entry rights	$ 100	200	100
Surface land over subsurface interests | Lease Revenue [Member]
Subsurface interests
Lease revenue	0	0	600
Real Estate Operations | Subsurface Revenue - Other
Subsurface interests
Revenue from contract with customer, including assessed tax	4,724	$ 638	150
Real Estate Operations | Subsurface Revenue, Land Sales
Subsurface interests
Revenue from contract with customer, including assessed tax	$ 4,600
Real Estate Operations | Subsurface Revenue, Lease
Subsurface interests
Lease revenue			$ 598