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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2021 |  | 779,937 |  |  | $ | 59.02 |
Granted |  | 323,048 |  |  | $ | 60.96 |
Released to participants |  | (222,254) |  |  | $ | 64.98 |
Forfeited |  | (47,997) |  |  | $ | 57.07 |
Nonvested December 31, 2022 |  | 832,734 |  |  | $ | 58.30 |
|  | 2022 |  | 2021 |  | 2020
Weighted-average grant date fair value (per share) |  | $ | 60.96 |  |  | $ | 46.84 |  |  | $ | 76.49 |
Fair value of units granted (thousands of dollars) |  | $ | 19,693 |  |  | $ | 19,542 |  |  | $ | 16,552 |
Grant date fair value of units vested (thousands of dollars) |  | $ | 14,442 |  |  | $ | 12,519 |  |  | $ | 11,204 |
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, 2021 |  | 976,585 |  |  | $ | 72.73 |
Granted |  | 399,315 |  |  | $ | 79.05 |
Released to participants |  | (267,538) |  |  | $ | 76.49 |
Forfeited |  | (62,656) |  |  | $ | 73.22 |
Nonvested December 31, 2022 |  | 1,045,706 |  |  | $ | 74.15 |
|  | 2022 |  | 2021 |  | 2020
Volatility (a) |  | 61.10% |  | 60.30% |  | 21.70%
Dividend yield |  | 6.15% |  | 8.13% |  | 4.87%
Risk-free interest rate |  | 1.78% |  | 0.21% |  | 1.39%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.
|  | 2022 |  | 2021 |  | 2020
Weighted-average grant date fair value (per share) |  | $ | 79.05 |  |  | $ | 62.03 |  |  | $ | 88.43 |
Fair value of units granted (thousands of dollars) |  | $ | 31,566 |  |  | $ | 33,632 |  |  | $ | 25,028 |
Grant date fair value of units vested (thousands of dollars) |  | $ | 20,464 |  |  | $ | 19,962 |  |  | $ | 17,722 |

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