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Net Income Per Unit (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Net Income Per Unit | The calculation of net income per unit is as follows (dollars in thousands, except units and per unit amounts):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Net income attributable to partners | $ | 96,749 |  |  | $ | 90,182 |  |  | $ | 69,409 |
Less: General partner's distribution (including IDRs) (1) | 33,492 |  |  | 25,777 |  |  | 18,797 |
Less: Limited partners' distribution | 83,873 |  |  | 76,113 |  |  | 69,057 |
Distributions in excess of earnings | $ | (20,616 | ) |  | $ | (11,708 | ) |  | $ | (18,445 | )
General partner's earnings: |  |  |  |  |
Distributions (including IDRs) (1) | $ | 33,492 |  |  | $ | 25,777 |  |  | $ | 18,797 |
Distributions in excess of earnings | (412 | ) |  | (234 | ) |  | (368 | )
Total general partner's earnings | $ | 33,080 |  |  | $ | 25,543 |  |  | $ | 18,429 |
Limited partners' earnings on common units: |  |  |  |  |
Distributions | $ | 83,873 |  |  | $ | 76,113 |  |  | $ | 69,057 |
Distributions in excess of earnings | (20,204 | ) |  | (11,474 | ) |  | (18,077 | )
Total limited partners' earnings on common units | $ | 63,669 |  |  | $ | 64,639 |  |  | $ | 50,980 |
Weighted average limited partner units outstanding: |  |  |  |  |
Common units - basic | 24,413,294 |  |  | 24,390,286 |  |  | 24,348,063 |
Common units - diluted | 24,418,641 |  |  | 24,396,881 |  |  | 24,376,972 |
Net income per limited partner unit: |  |  |  |  |
Common - basic | $ | 2.61 |  |  | $ | 2.65 |  |  | $ | 2.09 |
Common - diluted (2) | $ | 2.61 |  |  | $ | 2.65 |  |  | $ | 2.09 |
(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 12 for further discussion related to IDRs. (2) There were no outstanding common unit equivalents excluded from the diluted earnings per unit calculation during both years ended December 31, 2019 and December 31, 2017. Outstanding common unit equivalents totaling 1,776 were excluded from the diluted earnings per unit calculation for the years ended December 31, 2018, as these common unit equivalents did not have a dilutive effect under the treasury stock method.

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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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