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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 151,207 | $ 130,626 | $ 126,769 | $ 129,473 | $ 124,680 | $ 107,470 | $ 111,853 | $ 104,056 | $ 538,075 |  | $ 448,059 |  | $ 589,669 |
Operating income | 23,698 | 22,636 | 23,371 | 18,472 | 19,163 | 17,001 | 22,512 | 18,974 | 88,177 |  | 77,650 |  | 77,262 |
Net income | 18,914 | 16,923 | 18,977 | 14,595 | 15,312 | 13,151 | 18,893 | 15,448 | 69,409 |  | 62,804 |  | 66,211 |
Limited partners' interest in net income | $ 13,891 | $ 12,178 | $ 14,425 | $ 10,486 | $ 11,422 | $ 9,892 | $ 16,102 | $ 13,195 | $ 50,980 |  | $ 50,611 |  | $ 61,685 |
Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common (basic) | $ 0.57 | $ 0.50 | $ 0.59 | $ 0.43 | $ 0.47 | $ 0.41 | $ 0.66 | $ 0.54 | $ 2.09 | [1] | $ 2.08 | [1] | $ 2.55 | [1]
Common units - (diluted) | $ 0.57 | $ 0.50 | $ 0.59 | $ 0.43 | 0.47 | 0.41 | 0.66 | 0.54 | 2.09 | [1] | 2.07 | [1] | 2.52 | [1]
Subordinated- Delek |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated units - Delek (basic and diluted) |  |  |  |  | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.54 | $ 0.00 | [1] | $ 2.19 | [1] | $ 2.54 | [1]
[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 5 and 12 for further discussion.

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- Definition The amount of net income (loss) from continuing operations per each basic and diluted limited partnership and general partnership unit when the per unit amount is the same for both basic and diluted units. + References No definition available. + Details
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