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Net Income Per Unit Calculation of Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 25, 2016
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to partners |  |  |  |  |  |  |  |  |  | $ 90,182 | $ 69,409 | $ 62,804 |
(Distributions) earnings excess |  |  |  |  |  |  |  |  |  | $ (11,708) | $ (18,445) | $ (12,215) |
Footnote [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
General partner's ownership interest |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% | 2.00% |
Common units excluded from computation of earnings per share (in units) |  |  |  |  |  |  |  |  |  | 1,776 | 0 |  |
Maximum | First target distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Footnote [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution payment targets (in usd per unit) |  |  |  |  |  |  |  |  |  | $ 0.43125 |  |  |
General Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total earnings |  |  |  |  |  |  |  |  |  | $ 25,543 | $ 18,429 | $ 12,193 |
Common Units |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average limited partner units outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |
Common units - (basic) (in units) | [1] |  |  |  |  |  |  |  |  | 24,390,286 | 24,348,063 | 22,490,264 |
Common units - (diluted) (in units) | [1] |  |  |  |  |  |  |  |  | 24,396,881 | 24,376,972 | 22,558,717 |
Net income per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |
Common units - (basic) (in usd per unit) |  | $ 0.58 | $ 0.68 | $ 0.79 | $ 0.59 | $ 0.57 | $ 0.50 | $ 0.59 | $ 0.43 | $ 2.65 | $ 2.09 | $ 2.08 |
Common units - (diluted) (in usd per unit) |  | $ 0.58 | $ 0.68 | $ 0.79 | $ 0.59 | $ 0.57 | $ 0.50 | $ 0.59 | $ 0.43 | $ 2.65 | $ 2.09 | $ 2.07 |
Footnote [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common units excluded from computation of earnings per share (in units) |  |  |  |  |  |  |  |  |  |  |  | 4,240 |
Subordinated- Delek |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average limited partner units outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated units - Delek Holdings (basic and diluted) (in units) | [1] |  |  |  |  |  |  |  |  | 0 | 0 | 1,803,167 |
Net income per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated units - Delek Holdings (basic and diluted) (in usd per unit) |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 2.19 |
Footnote [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited Partners' capital account, units outstanding (in units) |  |  |  |  |  |  |  |  |  |  |  |  | 11,999,258
General Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to partners |  |  |  |  |  |  |  |  |  | $ 25,543 | $ 18,429 | $ 12,193 |
General partner's distribution | [2] |  |  |  |  |  |  |  |  | 25,777 | 18,797 | 12,437 |
(Distributions) earnings excess |  |  |  |  |  |  |  |  |  | (234) | (368) | (244) |
Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | 76,113 | 69,057 | 62,582 |
Limited Partner | Common Units |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | 76,113 | 69,057 | 58,158 |
(Distributions) earnings excess |  |  |  |  |  |  |  |  |  | (11,474) | (18,077) | (11,489) |
Total earnings |  |  |  |  |  |  |  |  |  | $ 64,639 | $ 50,980 | $ 46,669 |
Weighted average limited partner units outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |
Common units - (basic) (in units) | [3] |  |  |  |  |  |  |  |  | 24,390,286 | 24,348,063 | 22,490,264 |
Common units - (diluted) (in units) | [3] |  |  |  |  |  |  |  |  | 24,396,881 | 24,376,972 | 22,558,717 |
Net income per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |
Common units - (basic) (in usd per unit) |  |  |  |  |  |  |  |  |  | $ 2.65 | $ 2.09 | $ 2.08 |
Common units - (diluted) (in usd per unit) | [4] |  |  |  |  |  |  |  |  | $ 2.65 | $ 2.09 | $ 2.07 |
Limited Partner | Subordinated Units |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 4,424 |
(Distributions) earnings excess |  |  |  |  |  |  |  |  |  | 0 | 0 | (482) |
Total earnings |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 3,942 |
Weighted average limited partner units outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated units - Delek Holdings (basic and diluted) (in units) | [3],[5] |  |  |  |  |  |  |  |  | 0 | 0 | 1,803,167 |
Net income per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated units - Delek Holdings (basic and diluted) (in usd per unit) |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 2.19 |
Limited Partner | Subordinated- Delek |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to partners |  |  |  |  |  |  |  |  |  |  |  | $ 3,942 |
[1] | We base our calculation of net income per unit on the weighted-average number of common and subordinated limited partner units outstanding during the period. The weighted-average number of common and subordinated units reflect the conversion of the subordinated units to common units on February 25, 2016. See Notes 6 and 12 for further discussion.
[2] | 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.
[3] | We base our calculation of net income per unit on the weighted-average number of common and subordinated limited partner units outstanding during the period. The weighted-average number of common and subordinated units reflects the conversion of the subordinated units to common units on February 25, 2016.
[4] | Outstanding common unit equivalents totaling 1,776 and 4,240 were excluded from the diluted earnings per unit calculation for the years ended December 31, 2018 and 2016, respectively, as these common unit equivalents did not have a dilutive effect under the treasury stock method. There were no outstanding common unit equivalents excluded from the diluted earnings per unit calculation during the year ended December 31, 2017.
[5] | On February 25, 2016, all of the Partnership's 11,999,258 outstanding subordinated units converted into common units and began participating pro rata with the other common units in distributions of available cash. Distributions and the Partnership's net income were allocated to the subordinated units through February 24, 2016.

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