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Summary of quarterly financial data (unaudited) | 12 Months Ended
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Dec. 31, 2017
Summary of quarterly financial data (unaudited) |
Summary of quarterly financial data (unaudited) | (17) Summary of quarterly financial data (unaudited) The following summarizes certain consolidated operating results by quarter for 2017 and 2016. All periods presented have been revised for the change in accounting for pension and OPEB presentation. This change had no impact on Net income or Net income per share.
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|  | 2017 |  | 2016 |
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |  | March 31 |  | June 30 |  | September 30 |  | December 31 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | (dollars in thousands, except per share amounts) |
As Reported: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  | 104,739 |  | 116,314 |  | 137,245 |  | 192,473 |  | 95,576 |  | 115,365 |  | 111,590 |  | 115,432 |
Gross profit |  | 1,085 |  | 9,679 |  | 16,561 |  | 60,598 |  | (12,975 | ) | (8,405 | ) | (6,910 | ) | (737 | )
Research and development |  | 829 |  | 943 |  | 1,338 |  | (159 | ) | 651 |  | 786 |  | 526 |  | 436 |
Selling and administrative expenses |  | 11,683 |  | 12,195 |  | 13,322 |  | 12,279 |  | 13,794 |  | 13,423 |  | 12,215 |  | 18,352 |
Other expense (income), net |  | 3,067 |  | 1,186 |  | (643 | ) | (1,976 | ) | 237 |  | (1,198 | ) | (567 | ) | (660 | )
Net income (loss) |  | (26,344 | ) | (17,383 | ) | (3,919 | ) | 55,629 |  | (36,375 | ) | (128,399 | ) | (22,967 | ) | (48,102 | )
Net income (loss) per share |  | (0.09 | ) | (0.06 | ) | (0.01 | ) | 0.18 |  | (0.12 | ) | (0.42 | ) | (0.08 | ) | (0.16 | )
Effect of Change: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Gross profit |  | 201 |  | 201 |  | 201 |  | (809 | ) | 337 |  | 337 |  | 337 |  | (2,223 | )
Research and development |  | (8 | ) | (10 | ) | (9 | ) | 532 |  | (26 | ) | (26 | ) | (26 | ) | 213 |
Selling and administrative expenses |  | (28 | ) | (26 | ) | (28 | ) | 3,109 |  | (97 | ) | (97 | ) | (100 | ) | 1,025 |
Other expense (income), net |  | 237 |  | 237 |  | 238 |  | (4,450 | ) | 460 |  | 460 |  | 463 |  | (3,461 | )
Net income (loss) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Net income (loss) per share |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Revised: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  | 104,739 |  | 116,314 |  | 137,245 |  | 192,473 |  | 95,576 |  | 115,365 |  | 111,590 |  | 115,432 |
Gross profit |  | 1,286 |  | 9,880 |  | 16,762 |  | 59,789 |  | (12,638 | ) | (8,068 | ) | (6,573 | ) | (2,960 | )
Research and development |  | 821 |  | 933 |  | 1,329 |  | 373 |  | 625 |  | 760 |  | 500 |  | 649 |
Selling and administrative expenses |  | 11,655 |  | 12,169 |  | 13,294 |  | 15,388 |  | 13,697 |  | 13,326 |  | 12,115 |  | 19,377 |
Other expense (income), net |  | 3,304 |  | 1,423 |  | (405 | ) | (6,426 | ) | 697 |  | (738 | ) | (104 | ) | (4,121 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income (loss) |  | (26,344 | ) | (17,383 | ) | (3,919 | ) | 55,629 |  | (36,375 | ) | (128,399 | ) | (22,967 | ) | (48,102 | )
Net income (loss) per share |  | (0.09 | ) | (0.06 | ) | (0.01 | ) | 0.18 |  | (0.12 | ) | (0.42 | ) | (0.08 | ) | (0.16 | )

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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