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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2018 |  | 1,025,193 |  |  | $ | 34.68 |
Granted |  | 262,399 |  |  | $ | 58.07 |
Released to participants |  | (541,871 | ) |  | $ | 19.73 |
Forfeited |  | (46,731 | ) |  | $ | 49.61 |
Nonvested December 31, 2019 |  | 698,990 |  |  | $ | 54.05 |
|  | 2019 |  | 2018 |  | 2017
Weighted-average grant date fair value (per share) |  | $ | 58.07 |  |  | $ | 46.94 |  |  | $ | 45.11 |
Fair value of units granted (thousands of dollars) |  | $ | 15,238 |  |  | $ | 13,907 |  |  | $ | 12,685 |
Grant date fair value of units vested (thousands of dollars) |  | $ | 10,691 |  |  | $ | 9,552 |  |  | $ | 7,258 |
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, 2018 |  | 1,243,643 |  |  | $ | 44.08 |
Granted |  | 338,427 |  |  | $ | 68.02 |
Released to participants |  | (636,628 | ) |  | $ | 23.59 |
Forfeited |  | (7,621 | ) |  | $ | 39.54 |
Nonvested December 31, 2019 |  | 937,821 |  |  | $ | 66.67 |
|  | 2019 |  | 2018 |  | 2017
Volatility (a) |  | 27.10% |  | 39.20% |  | 40.59%
Dividend yield |  | 5.05% |  | 5.49% |  | 4.68%
Risk-free interest rate |  | 2.47% |  | 2.44% |  | 1.49%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.
|  | 2019 |  | 2018 |  | 2017
Weighted-average grant date fair value (per share) |  | $ | 68.02 |  |  | $ | 59.57 |  |  | $ | 56.65 |
Fair value of units granted (thousands of dollars) |  | $ | 23,020 |  |  | $ | 22,081 |  |  | $ | 17,621 |
Grant date fair value of units vested (thousands of dollars) |  | $ | 15,018 |  |  | $ | 12,545 |  |  | $ | 8,704 |

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