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STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Income tax benefits recognized | $ 0 | $ 0 | $ 0
Stock-based compensation expense, after tax | 14,799 | 15,851 | 14,424
Production costs |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | 1,105 | 2,164 | 1,451
General and administrative expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | 11,867 | 8,500 | 12,814
Exploration, evaluation and reclamation expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | 105 | 169 | 159
Transaction and integration expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | $ 1,722 | $ 5,018 | $ 0

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