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Schedule III - Supplemental Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Quarterly Financial Information [Table Text Block] |
2018 |  | 1st quarter |  |  | 2nd quarter |  |  | 3rd quarter |  |  | 4th quarter |  |  | Year |
Net sales |  | $ | 375,598 |  |  | $ | 452,917 |  |  | $ | 456,976 |  |  | $ | 429,590 |  |  | $ | 1,715,081 |
Operating income (a) |  |  | 12,345 |  |  |  | 24,319 |  |  |  | 18,614 |  |  |  | 1,774 |  |  |  | 57,052 |
Income (loss) before income taxes |  |  | 10,313 |  |  |  | 21,556 |  |  |  | 15,708 |  |  |  | (1,512 | ) |  |  | 46,065 |
Net income (loss) |  | $ | 7,629 |  |  | $ | 15,848 |  |  | $ | 11,599 |  |  | $ | (1,316 | ) |  | $ | 33,759 |
Basic net income (loss) per share |  | $ | 0.67 |  |  | $ | 1.39 |  |  | $ | 1.01 |  |  | $ | (0.11 | ) |  | $ | 2.95 |
Weighted average shares outstanding - basic |  |  | 11,418 |  |  |  | 11,435 |  |  |  | 11,444 |  |  |  | 11,444 |  |  |  | 11,432 |
Diluted net income (loss) per share |  | $ | 0.67 |  |  | $ | 1.39 |  |  | $ | 1.01 |  |  | $ | (0.11 | ) |  | $ | 2.95 |
Weighted average shares outstanding - diluted |  |  | 11,418 |  |  |  | 11,435 |  |  |  | 11,446 |  |  |  | 11,444 |  |  |  | 11,440 |
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 25.84 |  |  | $ | 24.27 |  |  | $ | 24.23 |  |  | $ | 21.41 |  |  | $ | 25.84 |
Low |  |  | 19.75 |  |  |  | 19.75 |  |  |  | 19.92 |  |  |  | 13.72 |  |  |  | 13.72 |
2017 |  | 1st quarter |  |  | 2nd quarter |  |  | 3rd quarter |  |  | 4th quarter |  |  | Year |
Net sales |  | $ | 334,893 |  |  | $ | 356,195 |  |  | $ | 331,442 |  |  | $ | 308,166 |  |  | $ | 1,330,696 |
Operating income (loss) (d) |  |  | 11,051 |  |  |  | 9,633 |  |  |  | 5,286 |  |  |  | (1,984 | ) |  |  | 23,986 |
Income (loss) before income taxes |  |  | 9,399 |  |  |  | 7,817 |  |  |  | 3,298 |  |  |  | (4,164 | ) |  |  | 16,350 |
Net income (b) |  | $ | 7,699 |  |  | $ | 4,797 |  |  | $ | 2,280 |  |  | $ | 4,187 |  |  | $ | 18,963 |
Basic net income per share |  | $ | 0.68 |  |  | $ | 0.42 |  |  | $ | 0.20 |  |  | $ | 0.37 |  |  | $ | 1.67 |
Weighted average shares outstanding - basic |  |  | 11,369 |  |  |  | 11,383 |  |  |  | 11,386 |  |  |  | 11,389 |  |  |  | 11,381 |
Diluted net income per share |  | $ | 0.68 |  |  | $ | 0.42 |  |  | $ | 0.20 |  |  | $ | 0.37 |  |  | $ | 1.67 |
Weighted average shares outstanding - diluted |  |  | 11,369 |  |  |  | 11,390 |  |  |  | 11,386 |  |  |  | 11,391 |  |  |  | 11,381 |
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 27.93 |  |  | $ | 24.00 |  |  | $ | 22.44 |  |  | $ | 22.86 |  |  | $ | 27.93 |
Low |  |  | 18.05 |  |  |  | 15.83 |  |  |  | 16.58 |  |  |  | 18.10 |  |  |  | 15.83 |

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