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COMMITMENTS
 6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
COMMITMENTS COMMITMENTS
At June 30, 2020, the future minimum payments under non-cancellable commitments were as follows:
 Environmental Remediation (a)Development Projects (b)Pension Contributions (c)Commitments (d)Total
Remaining 2020$710  $4,206  $2,476  $7,880  $15,272  
20212,387  160  681  14,193  17,421  
20222,023  220  —  16,992  19,235  
20232,012  232  —  17,719  19,963  
20242,012  232  —  14,987  17,231  
Thereafter2,784  2,770  —  39,877  45,431  
$11,928  $7,820  $3,157  $111,648  $134,553  

(a)Environmental remediation represents our estimate of potential liability associated with environmental contamination in Port Gamble, Washington.
(b)Primarily consisting of payments expected to be made on our Wildlight and Richmond Hill development projects.
(c)Pension contribution requirements are based on actuarially determined estimates and IRS minimum funding requirements.
(d)Commitments include payments expected to be made on foreign exchange contracts, timberland deeds and other purchase obligations.