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ENVIRONMENTAL AND NATURAL RESOURCE DAMAGE LIABILITIES - Schedule of Liabilities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]  
Beginning balance, non-current portion $ 10,110
Beginning balance, plus: current portion 695
Beginning balance 10,805
Expenditures charged to liabilities (136)
Increase to liabilities 654
Ending balance 11,323
Ending balance, less: current portion (774)
Ending balance, non-current portion $ 10,549