| Quarterly Financial Information [Table Text Block] |
| | | Quarter Ended | | | | | September 30 (Q1) | | | December 31 (Q2) | | | March 31 (Q3) | | | June 30 (Q4) | | | Net sales | | $ | 187,785 | | | $ | 197,152 | | | $ | 177,829 | | | $ | 183,918 | | | Gross profit | | $ | 101,450 | | | $ | 108,860 | | | $ | 98,394 | | | $ | 100,787 | | | Operating income (loss) | | $ | 11,799 | | | $ | 16,128 | | | $ | 10,669 | | | $ | (4,649 | ) | | Net Income (loss) | | $ | 8,840 | | | $ | 12,190 | | | $ | 7,978 | | | $ | (3,310 | ) | | Earnings (loss) per basic share | | $ | 0.33 | | | $ | 0.46 | | | $ | 0.30 | | | $ | (0.12 | ) | | Earnings (loss) per diluted share | | $ | 0.33 | | | $ | 0.45 | | | $ | 0.30 | | | $ | (0.12 | ) | | Diluted weighted average common shares | | | 26,940 | | | | 26,923 | | | | 26,751 | | | | 26,758 | | | Dividends declared per common share | | $ | 0.19 | | | $ | 1.19 | | | $ | 0.19 | | | $ | 0.19 | | | | | Quarter Ended | | | | | September 30 (Q1) | | | December 31 (Q2) | | | March 31 (Q3) | | | June 30 (Q4) | | | Net sales | | $ | 181,302 | | | $ | 198,481 | | | $ | 181,419 | | | $ | 205,582 | | | Gross profit | | $ | 100,323 | | | $ | 107,791 | | | $ | 96,708 | | | $ | 111,142 | | | Operating income | | $ | 11,549 | | | $ | 17,538 | | | $ | 3,873 | | | $ | 15,907 | | | Net Income | | $ | 7,415 | | | $ | 14,862 | | | $ | 2,616 | | | $ | 11,478 | | | Earnings per basic share | | $ | 0.27 | | | $ | 0.54 | | | $ | 0.10 | | | $ | 0.43 | | | Earnings per diluted share | | $ | 0.27 | | | $ | 0.54 | | | $ | 0.09 | | | $ | 0.42 | | | Diluted weighted average common shares | | | 27,756 | | | | 27,728 | | | | 27,692 | | | | 27,323 | | | Dividends declared per common share | | $ | 0.19 | | | $ | 0.50 | | | $ | 0.19 | | | $ | 0.19 | | |