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Net Income Per Unit | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Net Income Per Unit | Net Income Per Unit We use the two-class method when calculating the net income per unit applicable to limited partners because we have more than one participating class of securities. Our participating securities consist of common units, general partner units and IDRs. The two-class method is based on the weighted-average number of common units outstanding during the period. Basic net income per unit applicable to limited partners is 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 is 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. The IDRs are paid following the close of each quarter. Earnings in excess of distributions are allocated to our general partner and limited partners based on their respective ownership interests. Payments made to our unitholders are determined in relation to actual distributions declared and are not based on the net income allocations used in the calculation of net income per unit. Diluted net income per unit applicable to common limited partners includes the effects of potentially dilutive units on our common units. At present, 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 expected date of distribution for the distributions earned during the period ended March 31, 2018 is May 15, 2018. The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
|  | Three Months Ended
|  | March 31,
|  | 2018 |  | 2017
Net income attributable to partners |  | $ | 19,995 |  |  | $ | 14,595 |
Less: General partner's distribution (including IDRs) (1) |  | 5,710 |  |  | 4,237 |
Less: Limited partners' distribution |  | 18,287 |  |  | 16,787 |
Distributions in excess of earnings |  | $ | (4,002 | ) |  | $ | (6,429 | )
General partner's earnings: |  |  |  |
Distributions (including IDRs) (1) |  | $ | 5,710 |  |  | $ | 4,237 |
Allocation of distributions in excess of earnings |  | (80 | ) |  | (128 | )
Total general partner's earnings |  | $ | 5,630 |  |  | $ | 4,109 |
Limited partners' earnings on common units: |  |  |  |
Distributions |  | $ | 18,287 |  |  | $ | 16,787 |
Allocation of distributions in excess of earnings |  | (3,922 | ) |  | (6,301 | )
Total limited partners' earnings on common units |  | $ | 14,365 |  |  | $ | 10,486 |
Weighted average limited partner units outstanding (2): |  |  |  |
Common units - (basic) |  | 24,382,633 |  |  | 24,328,607 |
Common units - (diluted) |  | 24,393,746 |  |  | 24,380,770 |
Net income per limited partner unit (2): |  |  |  |
Common units - (basic) |  | $ | 0.59 |  |  | $ | 0.43 |
Common units - (diluted) |  | $ | 0.59 |  |  | $ | 0.43 |
(1) 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. See Note 9 for further discussion related to IDRs. (2) We base our calculation of net income per unit on the weighted-average number of common limited partner units outstanding during the period.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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