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Net Income Per Unit | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Unit | Net Income Per Unit Basic net income per unit applicable to limited partners is computed by dividing limited partners' interest in net income by the weighted-average number of outstanding common units. Prior to August 13, 2020, we had more than one class of participating securities and used the two class method to calculate the net income per unit applicable to the limited partners. The classes of participating units prior to August 13, 2020 consisted of limited partner units, general partner units and IDRs. Pursuant to the IDR Restructuring Transaction, the IDRs were eliminated and the 2% general partner economic interest was converted to a non-economic general partner interest. Effective August 13, 2020, the common limited partner units are the only participating security for cash distributions. Refer to Note 12 - Equity for a discussion of the elimination of the IDRs and conversion of the 2% general partner economic interest effective August 13, 2020. The two-class method was based on the weighted-average number of common units outstanding during the period. Basic net income per unit applicable to limited partners was computed by dividing limited partners’ interest in net income, after deducting our general partner’s 2% interest and IDRs, by the weighted-average number of outstanding common units. Our net income was allocated to our general partner and limited partners in accordance with their respective partnership percentages after giving effect to priority income allocations for IDRs, which are held by our general partner pursuant to our Partnership Agreement. Earnings in excess of distributions were allocated to our general partner and limited partners based on their respective ownership interests. The IDRs were paid following the close of each quarter. As discussed in Note 4 - Related Party Transactions, pursuant to Amendment No. 2 to the Partnership Agreement, an agreement was reached for a waiver of distributions in respect of the IDRs for the GP Additional Units associated with the 5.0 million Additional Units issued in connection with the Permian Gathering Assets Acquisition for at least two years, through at least the distribution for the quarter ending March 31, 2022. The IDR Waiver essentially reduced the distribution made to the holders of the IDRs during this period, as the holders would not receive a share of the distribution made on the GP Additional Units. An additional waiver letter was signed that waived all of the distributions for the first quarter of 2021 on the Additional Units with respect to base distributions and the IDRs. Refer to Note 4 for additional details. Subsequently, the IDRs were eliminated in the IDR Restructuring Transaction on August 13, 2020. Diluted net income per unit applicable to common limited partners includes the effects of potentially dilutive units on our common units. As of December 31, 2021, the only potentially dilutive units outstanding consist of unvested phantom units. Our distributions earned with respect to a given period are declared subsequent to quarter end. Therefore, the table below represents total cash distributions applicable to the period in which the distributions are earned. The date of distribution for the distributions earned during the quarterly period ended December 31, 2021 is February 8, 2022. The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Net income attributable to partners | $ | 164,822 |  |  | $ | 159,256 |  |  | $ | 96,749 |
Less: General partner's distribution (including IDRs) (1) | — |  |  | 18,618 |  |  | 33,492 |
Less: Limited partners' distribution | 164,484 |  |  | 127,070 |  |  | 83,873 |
Earning in excess (deficit) of distributions | $ | 338 |  |  | $ | 13,568 |  |  | $ | (20,616) |
General partner's earnings: |  |  |  |  |
Distributions (including IDRs) (1) | $ | — |  |  | $ | 18,618 |  |  | $ | 33,492 |
Allocation of earnings in excess (deficit) of distributions | — |  |  | 106 |  |  | (412) |
Total general partner's earnings | $ | — |  |  | $ | 18,724 |  |  | $ | 33,080 |
Limited partners' earnings on common units: |  |  |  |  |
Distributions | $ | 164,484 |  |  | $ | 127,070 |  |  | $ | 83,873 |
Allocation of earnings in excess (deficit) of distributions | 338 |  |  | 13,462 |  |  | (20,204) |
Total limited partners' earnings on common units | $ | 164,822 |  |  | $ | 140,532 |  |  | $ | 63,669 |
Weighted average limited partner units outstanding: |  |  |  |  |
Common units - basic | 43,447,739 |  |  | 33,594,284 |  |  | 24,413,294 |
Common units - diluted | 43,460,470 |  |  | 33,597,418 |  |  | 24,418,641 |
Net income per limited partner unit: |  |  |  |  |
Common - basic | $ | 3.79 |  |  | $ | 4.18 |  |  | $ | 2.61 |
Common - diluted (2) | $ | 3.79 |  |  | $ | 4.18 |  |  | $ | 2.61 |
(1) Prior to August 13, 2020, general partner distributions (including IDRs) consist of the 2% general partner interest and IDRs, which represent the right of the general partner to receive increasing percentages of quarterly distributions of available cash from operating surplus in excess of 0.43125 per unit per quarter. In connection with the IDR Restructuring Transaction on August 13, 2020, the IDRs were eliminated and the general partner interest became a non-economic general partner interest. See Note 12 for further discussion related to IDRs. (2) There were 4,458 and 5,201 outstanding common unit equivalents excluded from the diluted earnings per unit calculation during the years ended December 31, 2021 and 2020, respectively. There were no outstanding common unit equivalents excluded from the diluted earnings per unit calculation during the year ended December 31, 2019.

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