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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Net sales | $ 230,141 | $ 262,480 | $ 441,036 | $ 501,563
Operating costs and expenses: |  |  |  |
Cost of goods sold | 207,966 | 249,060 | 395,826 | 474,469
Operating expenses | 6,067 | 4,884 | 11,929 | 9,094
General and administrative expenses | 1,111 | 2,346 | 2,788 | 4,753
Depreciation and amortization | 2,372 | 2,260 | 4,724 | 4,394
Gain on sale of assets | 0 | (5) | 0 | 0
Total operating costs and expenses | 217,516 | 258,545 | 415,267 | 492,710
Operating income | 12,625 | 3,935 | 25,769 | 8,853
Interest expense, net | 752 | 622 | 1,569 | 1,110
Income before income tax expense | 11,873 | 3,313 | 24,200 | 7,743
Income tax expense | 118 | 826 | 240 | 2,746
Net income | 11,755 | 2,487 | 23,960 | 4,997
Comprehensive income | 11,755 | 2,487 | 23,960 | 4,997
Less: General partner's interest in net income (2%) | 234 |  | 478 |
Limited partners' interest in net income | $ 11,521 |  | $ 23,482 |
Net income per limited partner unit: |  |  |  |
Common units - (basic) | $ 0.48 |  | $ 0.98 |
Common units - (diluted) | $ 0.47 |  | $ 0.97 |
Subordinated units - Delek (basic and diluted) | $ 0.48 |  | $ 0.98 |
Weighted average limited partner units outstanding: |  |  |  |
Common units - (basic) | 12,006,843 |  | 12,003,071 |
Common units - (diluted) | 12,159,084 |  | 12,128,764 |
Subordinated units - Delek (basic and diluted) | 11,999,258 |  | 11,999,258 |
Cash distribution per unit | $ 0.395 |  | $ 0.780 |

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