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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Net sales | $ 80,262 | $ 88,567 | $ 289,216 | $ 347,670
Cost of sales | 116,641 | 100,365 | 329,630 | 326,053
Gross profit (loss) | (36,379) | (11,798) | (40,414) | 21,617
Selling, general and administrative expense | 9,962 | 11,602 | 31,730 | 37,348
Impairment of natural gas properties |  | 39,670 |  | 39,670
Other income, net | (409) | (866) | (20) | (1,357)
Operating loss | (45,932) | (62,204) | (72,124) | (54,044)
Interest expense, net | 13,333 | 872 | 21,129 | 6,498
Non-operating other expense (income), net | 2,451 | (23) | 437 | (103)
Loss from continuing operations before benefit for income taxes | (61,716) | (63,053) | (93,690) | (60,439)
Benefit for income taxes | (22,226) | (26,632) | (30,747) | (25,381)
Loss from continuing operations | (39,490) | (36,421) | (62,943) | (35,058)
Income from discontinued operations, net of taxes | 173,041 | 2,658 | 196,644 | 8,361
Net income (loss) | 133,551 | (33,763) | 133,701 | (26,697)
Dividends on convertible preferred stocks | 75 |  | 225 | 300
Dividend on Series E redeemable preferred stock |  |  | 22,351 |
Accretion of Series E redeemable preferred stock |  |  | 16,620 |
Net income attributable to participating securities | 1,920 |  | 1,718 |
Net income (loss) attributable to common stockholders | $ 112,047 | $ (33,763) | $ 92,787 | $ (26,997)
Basic: |  |  |  |
Loss from continuing operations | $ (2.25) | $ (1.60) | $ (4.17) | $ (1.56)
Income from discontinued operations, net of taxes | 6.39 | 0.12 | 7.89 | 0.37
Net income (loss) | 4.14 | (1.48) | 3.72 | (1.19)
Diluted: |  |  |  |
Loss from continuing operations | (2.25) | (1.60) | (4.17) | (1.56)
Income from discontinued operations, net of taxes | 6.39 | 0.12 | 7.89 | 0.37
Net income (loss) | $ 4.14 | $ (1.48) | $ 3.72 | $ (1.19)
Series E Preferred Stock [Member] |  |  |  |
Dividend on Series E redeemable preferred stock | $ 7,372 |  | $ 22,351 |
Accretion of Series E redeemable preferred stock | $ 12,137 |  | $ 16,620 |

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