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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental cash flow information:      
Cash paid for interest $ 2,096 $ 1,204 $ 3,089
Cash payments related to income taxes, net 18,860 4,172 255
Supplemental non-cash investing and financing activities:      
Property, plant and equipment acquired with equipment notes 0 9,407 1,216
Property, plant and equipment purchased but not yet paid 34,569 14,082 4,054
SNR Mineral Rights Acquisition 0 0 324,125
Revenue recognized in exchange for debt principal reduction 13,566 54,802 21,312
Paycheck Protection Loan forgiveness 0 3,401 0
Decrease in estimates of asset retirement costs 10,395 8,713 0
Operating right-of-use assets obtained in exchange for lease liabilities 168 0 2,932
Finance right-of-use assets obtained in exchange for lease liabilities $ 42 $ 88 $ 724