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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2017 |  | 1,001,805 |  |  | $ | 32.30 |
Granted |  | 296,277 |  |  | $ | 46.94 |
Released to participants |  | (243,289 | ) |  | $ | 39.26 |
Forfeited |  | (29,600 | ) |  | $ | 39.34 |
Nonvested December 31, 2018 |  | 1,025,193 |  |  | $ | 34.68 |
|  | 2018 |  | 2017 |  | 2016
Weighted-average grant date fair value (per share) |  | $ | 46.94 |  |  | $ | 45.11 |  |  | $ | 20.04 |
Fair value of units granted (thousands of dollars) |  | $ | 13,907 |  |  | $ | 12,685 |  |  | $ | 11,081 |
Fair value of units vested (thousands of dollars) |  | $ | 9,552 |  |  | $ | 7,258 |  |  | $ | 4,429 |
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, 2017 |  | 1,136,133 |  |  | $ | 40.08 |
Granted |  | 370,677 |  |  | $ | 59.57 |
Released to participants |  | (257,807 | ) |  | $ | 48.66 |
Forfeited |  | (5,360 | ) |  | $ | 46.97 |
Nonvested December 31, 2018 |  | 1,243,643 |  |  | $ | 44.08 |
|  | 2018 |  | 2017 |  | 2016
Volatility (a) |  | 39.20% |  | 40.59% |  | 39.94%
Dividend yield |  | 5.49% |  | 4.68% |  | 11.32%
Risk-free interest rate |  | 2.44% |  | 1.49% |  | 0.93%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.
|  | 2018 |  | 2017 |  | 2016
Weighted-average grant date fair value (per share) |  | $ | 59.57 |  |  | $ | 56.65 |  |  | $ | 25.54 |
Fair value of units granted (thousands of dollars) |  | $ | 22,081 |  |  | $ | 17,621 |  |  | $ | 15,229 |
Fair value of units vested (thousands of dollars) |  | $ | 12,545 |  |  | $ | 8,704 |  |  | $ | — |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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