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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables) | 12 Months Ended
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Dec. 31, 2021
Restricted Stock Units Activity |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity | The following tables set forth activity and various statistics for our restricted stock unit awards:
|  | Number of Units |  | Weighted Average Price
Nonvested December 31, 2020 |  | 646,287 |  |  | $ | 63.85 |
Granted |  | 417,212 |  |  | $ | 46.84 |
Released to participants |  | (242,765) |  |  | $ | 51.57 |
Forfeited |  | (40,797) |  |  | $ | 55.27 |
Nonvested December 31, 2021 |  | 779,937 |  |  | $ | 59.02 |
|  | 2021 |  | 2020 |  | 2019
Weighted-average grant date fair value (per share) |  | $ | 46.84 |  |  | $ | 76.49 |  |  | $ | 58.07 |
Fair value of units granted (thousands of dollars) |  | $ | 19,542 |  |  | $ | 16,552 |  |  | $ | 15,238 |
Grant date fair value of units vested (thousands of dollars) |  | $ | 12,519 |  |  | $ | 11,204 |  |  | $ | 10,691 |
Performance-Unit Activity |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity | The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations at the respective grant dates:
|  | Number of Units |  | Weighted Average Price
Nonvested December 31, 2020 |  | 834,246 |  |  | $ | 75.96 |
Granted |  | 542,183 |  |  | $ | 62.03 |
Released to participants |  | (311,907) |  |  | $ | 64.00 |
Forfeited |  | (87,937) |  |  | $ | 68.37 |
Nonvested December 31, 2021 |  | 976,585 |  |  | $ | 72.73 |
|  | 2021 |  | 2020 |  | 2019
Volatility (a) |  | 60.30% |  | 21.70% |  | 27.10%
Dividend yield |  | 8.13% |  | 4.87% |  | 5.05%
Risk-free interest rate |  | 0.21% |  | 1.39% |  | 2.47%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.
|  | 2021 |  | 2020 |  | 2019
Weighted-average grant date fair value (per share) |  | $ | 62.03 |  |  | $ | 88.43 |  |  | $ | 68.02 |
Fair value of units granted (thousands of dollars) |  | $ | 33,632 |  |  | $ | 25,028 |  |  | $ | 23,020 |
Grant date fair value of units vested (thousands of dollars) |  | $ | 19,962 |  |  | $ | 17,722 |  |  | $ | 15,018 |

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