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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.