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Quarterly information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information | Financial results by quarter for the years ended December 31, 2017 and 2016 are as follows:
| Net sales |  | Gross profit (loss) |  | Net income (loss) |  | Net income (loss) allocated to common stockholders |  | Basic earnings (loss) per share |  | Diluted earnings (loss) per share
2017 |  |  |  |  |  |  |  |  |  |  |
4th Quarter (1) | $ | 433,847 |  |  | $ | 47,892 |  |  | $ | 35,805 |  |  | $ | 32,963 |  |  | $ | 0.38 |  |  | $ | 0.37 |
3rd Quarter | 400,645 |  |  | 41,402 |  |  | 20,783 |  |  | 19,132 |  |  | 0.22 |  |  | 0.22 |
2nd Quarter | 388,802 |  |  | 22,460 |  |  | 7,131 |  |  | 6,563 |  |  | 0.08 |  |  | 0.07 |
1st Quarter (2) | 365,786 |  |  | 16,851 |  |  | (15,139 | ) |  | (15,139 | ) |  | (0.17 | ) |  | (0.17 | )
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4th Quarter (3) | $ | 339,836 |  |  | $ | 5,057 |  |  | $ | (168,464 | ) |  | $ | (168,464 | ) |  | $ | (1.93 | ) |  | $ | (1.93 | )
3rd Quarter (4) | 333,650 |  |  | (17,612 | ) |  | (58,273 | ) |  | (58,273 | ) |  | (0.67 | ) |  | (0.67 | )
2nd Quarter | 326,754 |  |  | 5,582 |  |  | (9,515 | ) |  | (9,515 | ) |  | (0.11 | ) |  | (0.11 | )
1st Quarter | 318,854 |  |  | (3,052 | ) |  | (16,163 | ) |  | (16,163 | ) |  | (0.19 | ) |  | (0.19 | )
(1) | The fourth quarter of 2017 was favorably impacted by a $7,310 gain on the extinguishment of a portion of our contractual commitments associated with the construction of the Helguvik project.
(2) | The first quarter of 2017 was unfavorably impacted by net losses on forward and derivative contracts of $16,137.
(3) | The fourth quarter of 2016 was unfavorably impacted by a $152,200 impairment charge for Helguvik.
(4) | The third quarter of 2016 was unfavorably impacted by a $23,000 charge related to the Ravenswood retiree medical proposed settlement.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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