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Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 124,680 | $ 107,470 | $ 111,853 | $ 104,056 | $ 108,931 | $ 165,092 | $ 172,134 | $ 143,512 | $ 448,059 |  | $ 589,669 |  | $ 841,253 |
Operating income | 19,163 | 17,001 | 22,512 | 18,974 | 17,862 | 21,847 | 21,139 | 16,414 | 77,650 |  | 77,262 |  | 78,846 |
Net income | 15,312 | 13,151 | 18,893 | 15,448 | 15,295 | 18,602 | 18,311 | 14,003 | 62,804 |  | 66,211 |  | 70,058 |
Limited partners' interest in net income | $ 11,422 | $ 9,892 | $ 16,102 | $ 13,195 | $ 13,511 | $ 17,219 | $ 17,202 | $ 13,753 | $ 50,611 |  | $ 61,685 |  | $ 69,631 |
Common Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common (basic) | $ 0.47 | $ 0.41 | $ 0.66 | $ 0.54 | $ 0.56 | $ 0.71 | $ 0.71 | $ 0.57 | $ 2.08 | [1] | $ 2.55 | [1] | $ 2.88 | [1]
Common units - (diluted) | 0.47 | 0.41 | 0.66 | 0.54 | 0.55 | 0.70 | 0.70 | 0.56 | 2.07 | [1] | 2.52 | [1] | 2.85 | [1]
Subordinated- Delek |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated units - Delek (basic and diluted) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.54 | $ 0.56 | $ 0.71 | $ 0.71 | $ 0.57 | $ 2.19 | [1] | $ 2.54 | [1] | $ 2.88 | [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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