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COMMITMENTS (Tables) | 12 Months Ended
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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 |
2022 | 1,864 |  |  | 267 |  |  |  |  | 17,232 |  |  | 19,363 |
2023 | 1,853 |  |  | 267 |  |  |  |  | 17,996 |  |  | 20,116 |
2024 | 1,853 |  |  | 267 |  |  |  |  | 15,228 |  |  | 17,348 |
2025 | 2,338 |  |  | 267 |  |  |  |  | 10,303 |  |  | 12,908 |
Thereafter | 2,706 |  |  | 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.

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