UNIT-BASED COMPENSATION (Tables)
|
12 Months Ended |
Dec. 31, 2019 |
|---|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Summary of long-term incentive plan compensation expense |
The following table summarizes information pertaining to all of our long-term incentive plans: | | | | | | | | | | | | | | | | | | | | | | | Units Outstanding December 31, | | Compensation Expense Year Ended December 31, | | 2019 | | 2018 | | 2017 | | 2019 | | 2018 | | 2017 | | | | | | | | (Thousands of Dollars) | Restricted Units: | | | | | | | | | | | | Domestic employees | 1,223,143 |
| | 1,028,484 |
| | 736,746 |
| | $ | 9,437 |
| | $ | 8,233 |
| | $ | 7,881 |
| Non-employee directors (NEDs) | 61,349 |
| | 59,752 |
| | 27,097 |
| | 774 |
| | 524 |
| | 251 |
| International employees | 10,243 |
| | 30,918 |
| | 58,107 |
| | 711 |
| | 1,158 |
| | 595 |
| Performance Units | 161,561 |
| | 158,326 |
| | 80,961 |
| | 4,172 |
| | 1,889 |
| | — |
| Unit Awards | — |
| | — |
| | — |
| | 22,846 |
| | 18,895 |
| | — |
| Total | 1,456,296 |
| | 1,277,480 |
|
| 902,911 |
|
| $ | 37,940 |
| | $ | 30,699 |
|
| $ | 8,727 |
|
|
| Restricted unit award activity |
A summary of our restricted unit activity for domestic employees and, beginning January 1, 2019, NEDs is as follows: | | | | | | | | | Number of Restricted Units | | Weighted-Average Grant-Date Fair Value Per Unit | Nonvested units as of January 1, 2017 | 647,340 |
| | $ | 39.72 |
| Granted | 307,009 |
| | 29.56 |
| Vested | (201,466 | ) | | 38.74 |
| Forfeited | (16,137 | ) | | 40.00 |
| Nonvested units as of December 31, 2017 | 736,746 |
| | 35.95 |
| Converted on July 20, 2018 | 53,447 |
| | 24.99 |
| Granted | 518,282 |
| | 24.07 |
| Vested | (235,746 | ) | | 35.12 |
| Forfeited | (44,245 | ) | | 36.05 |
| Nonvested units as of December 31, 2018 | 1,028,484 |
| | 29.47 |
| NEDs | 59,752 |
| | 20.93 |
| Granted | 596,881 |
| | 26.46 |
| Vested | (328,386 | ) | | 30.11 |
| Forfeited | (72,239 | ) | | 28.05 |
| Nonvested units as of December 31, 2019 | 1,284,492 |
|
| 27.48 |
|
|
| Performance Units [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Summary of long-term incentive plan compensation expense |
A summary of our performance units is shown below: | | | | | | | | | | | | | | Granted for Accounting Purposes | | Total Performance Units Awarded | | Performance Units | | Weighted-Average Grant Date Fair Value per Unit | Outstanding as of January 1, 2017 | 77,014 |
| | 35,373 |
| | $ | 31.75 |
| Granted | 39,320 |
| | 38,865 |
| | 50.04 |
| Performance adjustments (a) | 17,690 |
| | 17,690 |
| | 31.75 |
| Vested | (53,063 | ) | | (53,063 | ) | | 31.75 |
| Outstanding as of December 31, 2017 | 80,961 |
| | 38,865 |
| | 50.04 |
| Granted | 116,230 |
| | 80,690 |
| | 23.43 |
| Forfeitures | (38,865 | ) | | (38,865 | ) | | 50.04 |
| Outstanding as of December 31, 2018 | 158,326 |
| | 80,690 |
| | 23.43 |
| Granted | 95,969 |
| | 74,439 |
| | 28.01 |
| Vested | (80,690 | ) | | (80,690 | ) | | 23.43 |
| Forfeitures | (12,044 | ) | | — |
| | — |
| Outstanding as of December 31, 2019 | 161,561 |
| | 74,439 |
| | 28.01 |
|
(a) Represents the additional units issued to employees resulting from performance that exceeded the specified targets for the performance measures.
|
| Share-based Payment Arrangement [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Summary of long-term incentive plan compensation expense |
A summary of our unit awards is shown below: | | | | | | | | | | | | Date of Grant | | Grant Date Fair Value | | Unit Awards Granted | | Common Units Issued, Net of Employee Withholding Tax | | | (Thousands of Dollars) | | | | | February 11, 2020 | | $ | 22,846 |
| | 822,979 |
| | 563,806 |
| February 11, 2019 | | $ | 17,537 |
| | 704,886 |
| | 482,971 |
| July 23, 2018 | | $ | 1,358 |
| | 55,133 |
| | 35,745 |
|
|