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Net Income Per Unit (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Summary of Cash Distributions | 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 June 30, 2018 is August 13, 2018. The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Net income attributable to partners |  | $ | 25,582 |  |  | $ | 18,977 |  |  | $ | 45,577 |  |  | $ | 33,572 |
Less: General partner's distribution (including IDRs) (1) |  | 6,200 |  |  | 4,608 |  |  | 11,910 |  |  | 8,845 |
Less: Limited partners' distribution |  | 18,784 |  |  | 17,175 |  |  | 37,071 |  |  | 33,962 |
Earnings in excess (deficit) of distributions |  | $ | 598 |  |  | $ | (2,806 | ) |  | $ | (3,404 | ) |  | $ | (9,235 | )
General partner's earnings: |  |  |  |  |  |  |  |
Distributions (including IDRs) (1) |  | $ | 6,200 |  |  | $ | 4,608 |  |  | $ | 11,910 |  |  | $ | 8,845 |
Allocation of earnings in excess (deficit) of distributions |  | 12 |  |  | (56 | ) |  | (68 | ) |  | (184 | )
Total general partner's earnings |  | $ | 6,212 |  |  | $ | 4,552 |  |  | $ | 11,842 |  |  | $ | 8,661 |
Limited partners' earnings on common units: |  |  |  |  |  |  |  |
Distributions |  | $ | 18,784 |  |  | $ | 17,175 |  |  | $ | 37,071 |  |  | $ | 33,962 |
Allocation of earnings in excess (deficit) of distributions |  | 586 |  |  | (2,750 | ) |  | (3,336 | ) |  | (9,051 | )
Total limited partners' earnings on common units |  | $ | 19,370 |  |  | $ | 14,425 |  |  | $ | 33,735 |  |  | $ | 24,911 |
Weighted average limited partner units outstanding (2): |  |  |  |  |  |  |  |
Common units - (basic) |  | 24,386,031 |  |  | 24,335,338 |  |  | 24,384,341 |  |  | 24,331,991 |
Common units - (diluted) |  | 24,394,103 |  |  | 24,375,946 |  |  | 24,391,760 |  |  | 24,371,540 |
Net income per limited partner unit (2): |  |  |  |  |  |  |  |
Common units - (basic) |  | $ | 0.79 |  |  | $ | 0.59 |  |  | $ | 1.38 |  |  | $ | 1.02 |
Common units - (diluted) |  | $ | 0.79 |  |  | $ | 0.59 |  |  | $ | 1.38 |  |  | $ | 1.02 |
(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 Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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