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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net sales: |  |  |  |  |
Affiliate |  | $ 40,131 | $ 36,360 | $ 116,574 | $ 111,814
Third party |  | 90,495 | 71,110 | 270,294 | 211,565
Net sales |  | 130,626 | 107,470 | 386,868 | 323,379
Operating costs and expenses: |  |  |  |  |
Cost of goods sold |  | 89,120 | 73,527 | 266,749 | 213,381
Operating expenses |  | 10,662 | 9,251 | 30,986 | 28,445
General and administrative expenses |  | 2,751 | 2,307 | 8,255 | 7,918
Depreciation and amortization |  | 5,462 | 5,356 | 16,397 | 15,164
(Gain) loss on asset disposals |  | (5) | 28 | 2 | (16)
Total operating costs and expenses |  | 107,990 | 90,469 | 322,389 | 264,892
Operating income |  | 22,636 | 17,001 | 64,479 | 58,487
Interest expense, net |  | 7,124 | 3,409 | 16,657 | 9,892
(Income) loss from equity method investments |  | (1,584) | 308 | (3,005) | 743
Other income, net |  | (1) | 0 | (1) | 0
Total non-operating expenses |  | 5,539 | 3,717 | 13,651 | 10,635
Income before income tax expense |  | 17,097 | 13,284 | 50,828 | 47,852
Income tax expense |  | 174 | 133 | 333 | 360
Net income attributable to partners |  | 16,923 | 13,151 | 50,495 | 47,492
Comprehensive income attributable to partners |  | 16,923 | 13,151 | 50,495 | 47,492
Less: General partner's interest in net income, including incentive distribution rights |  | 4,745 | 3,259 | 13,406 | 8,303
Limited partners' interest in net income |  | $ 12,178 | $ 9,892 | $ 37,089 | $ 39,189
Weighted average limited partner units outstanding: |  |  |  |  |
Cash distributions per limited partner unit (in dollars per share) |  | $ 0.715 | $ 0.655 | $ 2.110 | $ 1.895
Common Units [Member] |  |  |  |  |
Net income per limited partner unit: |  |  |  |  |
Common units - (basic) (in dollars per share) | [1] | 0.50 | 0.41 | 1.52 | 1.61
Common units - (diluted) (in dollars per share) | [1] | $ 0.50 | $ 0.41 | $ 1.52 | $ 1.60
Weighted average limited partner units outstanding: |  |  |  |  |
Common units - (basic) (in shares) | [1] | 24,361,457 | 24,303,740 | 24,341,921 | 21,878,935
Common units - (diluted) (in shares) | [1] | 24,389,582 | 24,380,334 | 24,382,426 | 21,962,733
Subordinated unitholders - Delek [Member] |  |  |  |  |
Net income per limited partner unit: |  |  |  |  |
Subordinated units - Delek (basic and diluted) (in dollars per share) | [1] | $ 0.00 | $ 0.00 | $ 0.00 | $ 1.64
Weighted average limited partner units outstanding: |  |  |  |  |
Subordinated units - Delek (basic and diluted) (in shares) | [1] | 0 | 0 | 0 | 2,408,610
[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 7 for further discussion.

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