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Quarterly information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information | Financial results by quarter for the years ended December 31, 2016 and 2015 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
2016 |  |  |  |  |  |  |  |  |  |  |
4th Quarter (1) | $ | 339,836 |  |  | $ | 5,057 |  |  | $ | (168,464 | ) |  | $ | (168,464 | ) |  | $ | (1.93 | ) |  | $ | (1.93 | )
3rd Quarter (2) | 333,650 |  |  | (17,612 | ) |  | (58,273 | ) |  | (58,273 | ) |  | (0.67 | ) |  | (0.67 | )
2nd Quarter (3) | 326,754 |  |  | 5,582 |  |  | (9,515 | ) |  | (9,515 | ) |  | (0.11 | ) |  | (0.11 | )
1st Quarter (4) | 318,854 |  |  | (3,052 | ) |  | (16,163 | ) |  | (16,163 | ) |  | (0.19 | ) |  | (0.19 | )
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4th Quarter (5) | $ | 383,915 |  |  | $ | (18,701 | ) |  | $ | (43,080 | ) |  | $ | (43,080 | ) |  | $ | (0.50 | ) |  | $ | (0.50 | )
3rd Quarter (6) | 454,540 |  |  | (42,423 | ) |  | (56,112 | ) |  | (56,112 | ) |  | (0.65 | ) |  | (0.65 | )
2nd Quarter (7) | 523,491 |  |  | 8,342 |  |  | (33,897 | ) |  | (33,897 | ) |  | (0.39 | ) |  | (0.39 | )
1st Quarter (8) | 587,911 |  |  | 94,095 |  |  | 73,779 |  |  | 67,813 |  |  | 0.76 |  |  | 0.76 |
(1) | The fourth quarter of 2016 was unfavorably impacted by a $152,200 impairment charge for Helguvik and a $6,900 charge related to discrete tax items.
(2) | The third quarter of 2016 was unfavorably impacted by a $3,800 impairment charge related to Ravenswood assets and $23,000 charge related to the Ravenswood retiree medical proposed settlement.
(3) | The second quarter of 2016 was unfavorably impacted by a $4,900 LCM adjustment to cost of goods sold.
(4) | The first quarter of 2016 was favorably impacted by a $5,800 LCM adjustment to cost of goods sold.
(5) | The fourth quarter of 2015 was favorably impacted by a $23,474 lower of cost or market inventory adjustment, $3,400 related to non-cash, non-recurring post-retirement benefits. Results were negatively impacted by a $3,500 charge related to the partial curtailment of operations at Hawesville and Mt. Holly, a $5,000 charge for depreciation related to Mt. Holly purchase accounting and an $11,584 impairment charge at BHH.
(6) | The third quarter of 2015 was impacted by a $5,324 unfavorable lower of cost or market adjustment to cost of goods sold, $1,400 for labor disruption and $2,900 for partial curtailment expenses at Hawesville.
(7) | The second quarter of 2015 was impacted by a $25,689 unfavorable LCM adjustment to cost of goods sold and a $30,850 impairment reserve related to the permanent closure of our Ravenswood facility and $11,700 of labor disruption expenses associated with a new union contract at our Hawesville location in partially offset by a $10,287 gain on fair value of contingent consideration on our Mt. Holly acquisition.
(8) | The first quarter of 2015 included a $6,527 gain on fair value of contingent consideration partially offset by $1,570 of signing bonuses related to a new labor contract at Grundartangi and a $1,000 severance charge for a former executive.

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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=68076893&loc=d3e1280-108306 + Details
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