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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ 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
NET SALES: |  |  |  |  |  |  |  |  |  |  |
Related parties |  |  |  |  |  |  |  |  | $ 1,198,076 | $ 1,178,631 | $ 1,867,711
Other customers |  |  |  |  |  |  |  |  | 391,004 | 140,463 | 82,146
Total net sales | $ 433,847 | $ 400,645 | $ 388,802 | $ 365,786 | $ 339,836 | $ 333,650 | $ 326,754 | $ 318,854 | 1,589,080 | 1,319,094 | 1,949,857
Cost of goods sold |  |  |  |  |  |  |  |  | 1,460,475 | 1,330,136 | 1,908,544
Gross profit (loss) | 47,892 | 41,402 | 22,460 | 16,851 | 5,057 | (17,612) | 5,582 | (3,052) | 128,605 | (11,042) | 41,313
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 45,446 | 40,264 | 42,115
Helguvik (gains) losses |  |  |  |  |  |  |  |  | (7,310) | 152,220 | 0
Ravenswood (gains) |  |  |  |  |  |  |  |  | (5,500) | 26,830 | 30,850
Other operating expense - net |  |  |  |  |  |  |  |  | 2,111 | 3,857 | 7,436
Operating income (loss) |  |  |  |  |  |  |  |  | 93,858 | (234,213) | (39,088)
Interest expense |  |  |  |  |  |  |  |  | (22,174) | (22,216) | (21,954)
Interest income |  |  |  |  |  |  |  |  | 1,397 | 758 | 339
Net (loss) gain on forward and derivative contracts |  |  |  | (16,137) |  |  |  |  | (16,549) | 3,487 | 1,600
Unrealized gain on fair value of contingent consideration |  |  |  |  |  |  |  |  | 0 | 0 | 18,337
Other (expense) income - net |  |  |  |  |  |  |  |  | (1,161) | 1,319 | (356)
Income (loss) before income taxes and equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 55,371 | (250,865) | (41,122)
Income tax expense |  |  |  |  |  |  |  |  | (7,583) | (2,824) | (9,276)
Income (loss) before equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 47,788 | (253,689) | (50,398)
BHH impairment |  |  |  |  |  |  |  |  | 0 | 0 | (11,584)
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 792 | 1,274 | 2,672
Net income (loss) | $ 35,805 | $ 20,783 | $ 7,131 | $ (15,139) | $ (168,464) | $ (58,273) | $ (9,515) | $ (16,163) | $ 48,580 | $ (252,415) | $ (59,310)
INCOME (LOSS) PER COMMON SHARE: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.38 | $ 0.22 | $ 0.08 | $ (0.17) | $ (1.93) | $ (0.67) | $ (0.11) | $ (0.19) | $ 0.51 | $ (2.90) | $ (0.68)
Diluted (in dollars per share) | $ 0.37 | $ 0.22 | $ 0.07 | $ (0.17) | $ (1.93) | $ (0.67) | $ (0.11) | $ (0.19) | $ 0.51 | $ (2.90) | $ (0.68)

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