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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Share-based Payment Arrangement, Expensed and Capitalized, Amount | Stock-based compensation expense has been recognized as follows (in thousands):
|  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Cost of sales (1) |  | $ | 797 |  |  | $ | 1,105 |  |  | $ | 2,164 |
General and administrative expense |  |  | 5,579 |  |  |  | 11,867 |  |  |  | 8,500 |
Exploration, evaluation and reclamation expense |  |  | 97 |  |  |  | 105 |  |  |  | 169 |
Other operating expenses, net |  |  | — |  |  |  | 1,722 |  |  |  | 5,018 |
|  | $ | 6,473 |  |  | $ | 14,799 |  |  | $ | 15,851 |
(1) Excludes depreciation, depletion, and amortization.
Schedule of Stock Options Roll Forward | The following table summarizes the changes in stock options outstanding during the year ended December 31, 2022 (in thousands except per share amounts):
|  | Number of Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Balance as of January 1, 2022 |  | 261 |  |  | $ | 16.32 |  |  |  |  |  |
Granted |  | — |  |  |  | — |  |  |  |  |  |
Exercised |  | (180) |  |  |  | 13.68 |  |  |  |  |  |
Forfeited |  | (4) |  |  |  | 21.13 |  |  |  |  |  |
Expired |  | (4) |  |  |  | 21.48 |  |  |  |  |  |
Balance as of December 31, 2022 |  | 73 |  |  |  | 18.53 |  |  | 4.0 |  | $ | 60 |
Vested and exercisable at December 31, 2022 |  | 64 |  |  |  | 18.08 |  |  | 3.9 |  | $ | 60 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following table includes the assumptions used and other information related to stock options during the years ended December 31:
| 2022 |  | 2021 |  | 2020
Expected dividend yield (%) |  | N/A |  |  | N/A |  |  | — |
Risk-free interest rate (%) |  | N/A |  |  | N/A |  |  | 1.31 |
Expected life (years) |  | N/A |  |  | N/A |  |  | 4.20
Expected volatility (%) |  | N/A |  |  | N/A |  |  | 45.80 |
Weighted-average grant-date fair value (per option) |  | N/A |  | $ | N/A |  | $ | 17.76
Intrinsic value of options exercised (in thousands) | $ | 840 |  |  | $ | 4,814 |  |  | $ | 9,780 |
Fair value of options vested (in thousands) | $ | 337 |  |  | $ | 1,430 |  |  | $ | 5,006 |
Share-based Payment Arrangement, Deferred Share Units, Activity | The following table summarizes the changes in DSUs and DSU Replacement Units outstanding during the year ended December 31, 2022 (in thousands except per share amounts):
|  | Number of Shares |  | Weighted Grant Date Fair Value Per Share |  | Aggregate Intrinsic Value
Balance as of January 1, 2022 |  | 682 |  |  | $ | 23.95 |  |  |  |
Granted |  | 69 |  |  |  | 17.31 |  |  |  |
Exercised/Released |  | (229) |  |  |  | 15.74 |  |  |  |
Canceled/Forfeited |  | — |  |  |  | — |  |  |  |
Reinvested |  | 10 |  |  |  | 15.13 |  |  |  |
Balance as of December 31, 2022 |  | 532 |  |  |  | 26.46 |  |  | $ | 8,331 |
Share-based Payment Arrangement, Restricted Stock Units, Activity | The following table summarizes the changes in RSUs and RSU Replacement Units outstanding during the year ended December 31, 2022 (in thousands except per share amounts):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate intrinsic value
Balance as of January 1, 2022 |  | 869 |  |  | $ | 23.10 |  |  |  |
Granted |  | 412 |  |  |  | 17.83 |  |  |  |
Exercised/Released |  | (650) |  |  |  | 21.48 |  |  |  |
Canceled/Forfeited |  | (62) |  |  |  | 17.63 |  |  |  |
Reinvested |  | 10 |  |  |  | 18.18 |  |  |  |
Balance as of December 31, 2022 |  | 579 |  |  |  | 21.49 |  |  | $ | 9,071 |
Share-based Payment Arrangement, Performance Shares, Activity | The following table summarizes the changes in PSUs and PSU Replacement Units outstanding during the year ended December 31, 2022:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Balance as of January 1, 2022 |  | 800 |  |  | $ | 25.34 |  |  |  |
Granted |  | 305 |  |  |  | 18.06 |  |  |  |
Exercised/Released |  | (432) |  |  |  | 21.83 |  |  |  |
Canceled/Forfeited |  | (36) |  |  |  | 19.07 |  |  |  |
Reinvested |  | 12 |  |  |  | 18.98 |  |  |  |
Balance as of December 31, 2022 |  | 649 |  |  |  | 24.49 |  |  | $ | 10,182 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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