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COMMITMENTS (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases At December 31, 2020, the future minimum payments under non-cancellable commitments were as follows:
 Environmental Remediation (a)Development Projects (b)Commitments (c)Total
2021$1,026 $10,723 $14,341 $26,090 
20221,864 267 17,232 19,363 
20231,853 267 17,996 20,116 
20241,853 267 15,228 17,348 
20252,338 267 10,303 12,908 
Thereafter2,706 3,899 29,171 35,776 
$11,640 $15,690 $104,271 $131,601 

(a)Environmental remediation represents our estimate of potential liability associated with environmental contamination and Natural Resource Damages (NRD) in Port Gamble, Washington. See Note 13 - Environmental and Natural Resource Damage Liabilities for additional information.
(b)Primarily consisting of payments expected to be made on our Wildlight, Richmond Hill and West Puget Sound development projects.
(c)Commitments include payments expected to be made on derivative financial instruments (interest rate swaps and forward-starting interest rate swaps), timberland deeds and other purchase obligations.