OTHER ASSETS - Asset Balances (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Long-term and prepaid and secondary roads	$ 9,854,000	$ 8,463,000
Patronage Equity	6,685,000	5,217,000
Fair value of marketable equity securities, carrying amount	0	10,582,000
Revolving Credit Facility
Finite-Lived Intangible Assets [Line Items]
Deferred financing costs related to revolving debt	1,040,000	$ 102,000
Pope Resources
Finite-Lived Intangible Assets [Line Items]
Number of limited partnership units (in shares)		114,400
Original share price (in dollars per share)		$ 65.90
Software Costs
Finite-Lived Intangible Assets [Line Items]
Capitalized software costs	3,651,000	$ 3,605,000
Pacific Northwest
Finite-Lived Intangible Assets [Line Items]
Long-term and prepaid and secondary roads	4,087,000	4,198,000
New Zealand
Finite-Lived Intangible Assets [Line Items]
Long-term and prepaid and secondary roads	$ 5,767,000	$ 4,265,000