ENVIRONMENTAL AND NATURAL RESOURCE DAMAGE LIABILITIES - Changes in Environmental and NRD Liabilities (Details) $ in Thousands	6 Months Ended
Jun. 30, 2026 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance, non-current portion	$ 6,089
Beginning balance, plus: current portion	3,181
Beginning balance	9,270
Liabilities assumed in merger with Pope Resources	679
Expenditures charged to liabilities	(514)
Increase to liabilities	171
Ending balance	9,606
Ending balance, less: current portion	(5,996)
Ending balance, non-current portion	3,610
Port Gamble, WA
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance, non-current portion	6,089
Beginning balance, plus: current portion	3,181
Beginning balance	9,270
Liabilities assumed in merger with Pope Resources	0
Expenditures charged to liabilities	(460)
Increase to liabilities	171
Ending balance	8,981
Ending balance, less: current portion	(5,778)
Ending balance, non-current portion	3,203
Other Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance, non-current portion	0
Beginning balance, plus: current portion	0
Beginning balance	0
Liabilities assumed in merger with Pope Resources	679
Expenditures charged to liabilities	(54)
Increase to liabilities	0
Ending balance	625
Ending balance, less: current portion	(218)
Ending balance, non-current portion	$ 407

Accrual for Environmental Loss Contingencies Increase (Decrease) to Liability

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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- Definition

Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

+ References

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Amount of increase (decrease) in the obligation for environmental loss contingencies from business acquisitions (divestitures).

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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