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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
NET SALES: |  |  |  |
Related parties | $ 282.7 | $ 296.3 | $ 579.0 | $ 576.8
Other customers | 187.3 | 92.5 | 345.5 | 177.8
Total net sales | 470.0 | 388.8 | 924.5 | 754.6
Cost of goods sold | 436.3 | 366.3 | 876.2 | 715.3
Gross profit | 33.7 | 22.5 | 48.3 | 39.3
Selling, general and administrative expenses | 12.0 | 9.4 | 22.7 | 20.1
Other operating expense, net | 0.2 | 0.2 | 0.6 | 1.1
Operating income | 21.5 | 12.9 | 25.0 | 18.1
Interest expense | (5.6) | (5.5) | (11.2) | (11.0)
Interest income | 0.5 | 0.3 | 0.9 | 0.5
Net gain (loss) on forward and derivative contracts | 1.2 | 3.0 | 1.9 | (13.2)
Other income (expense) - net | 2.1 | (1.9) | 1.3 | (1.5)
Income (loss) before income taxes and equity in earnings of joint ventures | 19.7 | 8.8 | 17.9 | (7.1)
Income tax expense | (2.3) | (1.4) | (1.4) | (1.1)
Income (loss) before equity in earnings of joint ventures | 17.4 | 7.4 | 16.5 | (8.2)
Equity in earnings of joint ventures | 2.0 | (0.3) | 2.6 | 0.2
Net income (loss) | 19.4 | 7.1 | 19.1 | (8.0)
Net income (loss) allocated to common stockholders | $ 17.9 | $ 6.6 | $ 17.6 | $ (8.0)
EARNINGS (LOSS) PER COMMON SHARE: |  |  |  |
Earnings per share, basic (shares) | $ 0.20 | $ 0.08 | $ 0.20 | $ (0.09)
Earnings per share, diluted (shares) | $ 0.20 | $ 0.07 | $ 0.20 | $ (0.09)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING: |  |  |  |
Basic (shares) | 87.6 | 87.3 | 87.6 | 87.3
Diluted (shares) | 88.4 | 88.1 | 88.4 | 87.3

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