Long-Term Incentive Plan (Tables)
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12 Months Ended |
Dec. 31, 2018 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Changes In Non-Vested Unit Awards |
The amounts below do not include adjustments for above-target or below-target performance. | | | | | | | | | | | | | | | | | | | | | | | | | Performance-Based Awards | | Time-Based Awards | | Total Awards | | | Number of Unit Awards | | Weighted-Average Fair Value | | Number of Unit Awards | | Weighted-Average Fair Value | | Number of Unit Awards | | Weighted-Average Fair Value | Non-vested units - 1/1/2018 | | 356,068 |
| | $ | 76.40 |
| | 61,104 |
| | $ | 71.36 |
| | 417,172 |
| | $ | 75.66 |
| Units granted during 2018 | | 218,923 |
| | $ | 73.80 |
| | 83,564 |
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| $ | 71.03 |
|
| 302,487 |
| | $ | 73.03 |
| Units vested during 2018 | | (173,718 | ) | | $ | 70.30 |
| | (31,028 | ) | | $ | 64.25 |
| | (204,746 | ) | | $ | 69.39 |
| Units forfeited during 2018 | | (11,258 | ) | | $ | 76.21 |
| | (2,252 | ) | | $ | 71.56 |
| | (13,510 | ) | | $ | 75.44 |
| Non-vested units - 12/31/18 | | 390,015 |
| | $ | 77.66 |
| | 111,388 |
| | $ | 73.09 |
| | 501,403 |
| | $ | 76.65 |
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| Total Non-Vested Unit Awards |
The table below summarizes the total non-vested unit awards outstanding adjusted for estimated amounts of above-target financial performance to determine the total number of unit awards included in our total equity-based liability accrual. | | | | | | | | | | | | | | | | | | Grant Date | | Non-Vested Unit Awards | | Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results | | Total Unit Award Accrual | | Vesting Date | | Unrecognized Compensation Expense(a) (in millions) | | Performance-Based Awards: | | | | | | | | | | | | 2017 Awards | | 176,924 |
| | 159,232 |
| | 336,156 |
| | 12/31/2019 | | $ | 9.0 |
| | 2018 Awards | | 213,091 |
| | — |
| | 213,091 |
| | 12/31/2020 | | 10.5 |
| | Time-Based Awards: | | | | | | | | | | | | 2019 Vesting Date | | 31,835 |
| | — |
| | 31,835 |
| | 12/31/2019 | | 0.9 |
| | 2020 Vesting Date | | 79,553 |
| | — |
| | 79,553 |
| | 12/31/2020 | | 3.9 |
| | Total | | 501,403 |
| | 159,232 |
| | 660,635 |
| | | | $ | 24.3 |
| | | | | | | | | | | | | |
(a) Unrecognized compensation expense will be recognized over the remaining vesting period of the awards.
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| Weighted-Average Grant Date Fair Values |
The weighted-average fair value of awards granted during 2016, 2017 and 2018 was as follows: | | | | | | | | | | | | | | | | | | Performance-Based Awards | | Time-Based Awards | | | Number of Unit Awards | | Weighted-Average Fair Value | | Number of Unit Awards | | Weighted-Average Fair Value | Units granted during 2016 | | 193,344 |
| | $ | 70.29 |
| | 39,301 |
| | $ | 64.76 |
| Units granted during 2017 | | 189,544 |
| | $ | 82.34 |
| | 30,604 |
| | $ | 79.10 |
| Units granted during 2018 | | 218,923 |
| | $ | 73.80 |
| | 83,564 |
| | $ | 71.03 |
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| Vested Unit Awards |
The table below sets forth the numbers and values of units that vested in each of the three years ended December 31, 2018. The vested limited partner units include adjustments for above-target financial and market performance. | | | | | | | | Vesting Date | | Vested Limited Partner Units | | Fair Value of Unit Awards on Vesting Date (in millions) | | Intrinsic Value of Unit Awards on Vesting Date (in millions) | 12/31/2016 | | 361,711 | | $22.6 | | $27.4 | 12/31/2017 | | 266,028 | | $19.9 | | $18.9 | 12/31/2018 | | 317,037 | | $22.1 | | $18.1 | | | | | | | |
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| Cash Flow Effects Of Long Term Incentive Plan Settlements [Table Text Block] |
The difference between the limited partner units issued to the participants and the total number of unit awards vested primarily represents the tax withholdings associated with the award settlement, which we pay in cash. | | | | | | | | | | Settlement Date | | Number of Limited Partner Units Issued, Net of Tax Withholdings | | Tax Withholdings and Other Cash Payments (in millions) | | Employer Taxes (in millions) | | Total Cash Payments (in millions) | February 2016 | | 350,552 | | $14.4 | | $1.4 | | $15.8 | January 2017 | | 216,679 | | $13.9 | | $1.2 | | $15.1 | January 2018 | | 168,913 | | $9.3 | | $1.1 | | $10.4 |
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| Equity-Based Incentive Compensation Expense |
Equity-based incentive compensation expense for 2016, 2017 and 2018 was as follows (in thousands): | | | | | | | | | | | | | | | | Year Ended December 31, | | | 2016 | | 2017 | | 2018 | Performance awards | | $ | 17,106 |
| | $ | 17,823 |
| | $ | 28,728 |
| Time-based awards | | 2,252 |
| | 2,818 |
| | 3,325 |
| Total | | $ | 19,358 |
| | $ | 20,641 |
| | $ | 32,053 |
| | | | | | | | Allocation of LTIP expense on our consolidated statements of income: | | | | | | G&A expense | | $ | 19,204 |
| | $ | 20,463 |
| | $ | 31,788 |
| Operating expense | | 154 |
| | 178 |
| | 265 |
| Total | | $ | 19,358 |
| | $ | 20,641 |
| | $ | 32,053 |
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