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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Expensed and Capitalized, Amount | Stock-based compensation expense has been recognized as follows (in thousands):
|  | Years Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Production costs |  | $ | 1,105 |  |  | $ | 2,164 |  |  | $ | 1,451 |
General and administrative expense |  |  | 11,867 |  |  |  | 8,500 |  |  |  | 12,814 |
Exploration, evaluation and reclamation expense |  |  | 105 |  |  |  | 169 |  |  |  | 159 |
Transaction and integration expense |  |  | 1,722 |  |  |  | 5,018 |  |  |  | — |
Income tax benefits recognized |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 14,799 |  |  | $ | 15,851 |  |  | $ | 14,424 |
Schedule of Stock Options Roll Forward | The following table summarizes the changes in stock options outstanding during the year ended December 31, 2021 (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 at January 1, 2021 |  | 1,405 |  |  | $ | 13.54 |  |  |  |  |
Granted |  | — |  |  |  | — |  |  |  |  |  |
Exercised |  | (818) |  |  |  | 10.14 |  |  |  |  |
Forfeited |  | (318) |  |  |  | 20.12 |  |  |  |  |
Expired |  | (8) |  |  |  | 8.57 |  |  |  |  |
Balance at December 31, 2021 |  | 261 |  |  |  | 16.32 |  | 4.1 |  | $ | 774
Vested and exercisable at December 31, 2021 |  | 200 |  |  |  | 15.59 |  | 3.9 |  | $ | 677
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:
| 2021 |  | 2020 |  | 2019
Expected dividend yield (%) |  | N/A |  |  | — |  |  |  | — |
Risk-free interest rate (%) |  | N/A |  |  | 1.31 |  |  |  | 1.78 |
Expected life (years) |  | N/A |  |  | 4.20 |  |  | 4.20
Expected volatility (%) |  | N/A |  |  | 45.80 |  |  |  | 45.80 |
Weighted-average grant-date fair value (per option) |  | N/A |  | $ | 17.76 |  |  | $ | 11.75 |
Intrinsic value of options exercised (in thousands) | $ | 4,814 |  |  | $ | 9,780 |  |  | $ | 8,382 |
Fair value of options vested (in thousands) | $ | 1,430 |  |  | $ | 5,006 |  |  | $ | 1,828 |
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, 2021 (in thousands except per share amounts):
|  | Number of Shares |  | Weighted Grant Date Fair Value Per Share |  | Aggregate Intrinsic Value
Balance at January 1, 2021 |  | 748 |  |  | $ | 21.76 |  |  |
Granted |  | 89 |  |  |  | 15.75 |  |  |
Exercised/Released |  | (165) |  |  |  | 9.07 |  |  |
Canceled/Forfeited |  | — |  |  |  | — |  |  |  |
Reinvested |  | 10 |  |  |  | 14.51 |  |  |
Balance at December 31, 2021 |  | 682 |  |  |  | 23.95 |  | $ | 12,072 |
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, 2021 (in thousands except per share amounts):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate intrinsic value
Balance at January 1, 2021 |  | 749 |  |  | $ | 23.42 |  |  |
Granted |  | 388 |  |  |  | 18.63 |  |  |
Exercised/Released |  | (197) |  |  |  | 16.81 |  |  |
Canceled/Forfeited |  | (82) |  |  |  | 19.82 |  |  |
Reinvested |  | 11 |  |  |  | 21.34 |  |  |
Balance at December 31, 2021 |  | 869 |  |  |  | 23.10 |  |  | $ | 15,370 |
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, 2021:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Balance at January 1, 2021 |  | 1,114 |  |  | $ | 24.69 |  |  |
Granted |  | 560 |  |  |  | 20.52 |  |  |
Exercised/Released |  | (813) |  |  |  | 21.34 |  |  |
Canceled/Forfeited |  | (71) |  |  |  | 22.35 |  |  |
Reinvested |  | 10 |  |  |  | 21.70 |  |  |  |
Balance at December 31, 2021 |  | 800 |  |  |  | 25.34 |  |  | $ | 14,169 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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