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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Net Sales: |  |  |  |  |
Affiliate |  | $ 39,824 | $ 36,694 | $ 76,443 | $ 75,454
Third party |  | 86,945 | 75,159 | 179,799 | 140,455
Net sales |  | 126,769 | 111,853 | 256,242 | 215,909
Operating costs and expenses: |  |  |  |  |
Cost of goods sold |  | 85,039 | 73,101 | 177,629 | 139,854
Operating expenses |  | 9,966 | 8,730 | 20,324 | 19,194
General and administrative expenses |  | 2,656 | 2,698 | 5,504 | 5,611
Depreciation and amortization |  | 5,742 | 4,812 | 10,935 | 9,808
(Gain) loss on asset disposals |  | (5) | 0 | 7 | (44)
Total operating costs and expenses |  | 103,398 | 89,341 | 214,399 | 174,423
Operating income |  | 23,371 | 22,512 | 41,843 | 41,486
Interest expense, net |  | 5,462 | 3,284 | 9,533 | 6,483
(Income) loss from equity method investments |  | (1,176) | 206 | (1,421) | 435
Total non-operating expenses |  | 4,286 | 3,490 | 8,112 | 6,918
Income before income tax expense |  | 19,085 | 19,022 | 33,731 | 34,568
Income tax expense |  | 108 | 129 | 159 | 227
Net income attributable to partners |  | 18,977 | 18,893 | 33,572 | 34,341
Comprehensive income attributable to partners |  | 18,977 | 18,893 | 33,572 | 34,341
Less: General partner's interest in net income, including incentive distribution rights |  | 4,552 | 2,791 | 8,661 | 5,044
Limited partners' interest in net income |  | $ 14,425 | $ 16,102 | $ 24,911 | $ 29,297
Cash distributions per limited partner unit |  | $ 0.705 | $ 0.630 | $ 1.395 | $ 1.240
Common Units [Member] |  |  |  |  |
Net income per limited partner unit: |  |  |  |  |
Common units - (basic) | [1] | 0.59 | 0.66 | 1.02 | 1.23
Common units - (diluted) | [1] | $ 0.59 | $ 0.66 | $ 1.02 | $ 1.22
Weighted average limited partner units outstanding: |  |  |  |  |
Common units - (basic) | [1] | 24,335,338 | 24,281,930 | 24,331,991 | 20,653,210
Common units - (diluted) | [1] | 24,375,946 | 24,367,091 | 24,371,540 | 20,735,389
Subordinated unitholders - Delek |  |  |  |  |
Net income per limited partner unit: |  |  |  |  |
Subordinated units - Delek (basic and diluted) | [1] | $ 0.00 | $ 0.00 | $ 0.00 | $ 1.09
Weighted average limited partner units outstanding: |  |  |  |  |
Subordinated units - Delek (basic and diluted) | [1] | 0 | 0 | 0 | 3,626,149
[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 Note 6 for further discussion.

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