| Schedule of Quarterly Financial Information [Table Text Block] |
Summarized unaudited quarterly financial results for 2012 and 2011 follows: | | | | | | | | | | | | | | | | | | 2012 Quarter | | First | | Second | | Third | | Fourth | | | (in thousands, except per share amounts) | Net sales | | $ | 495,952 |
| | $ | 454,879 |
| | $ | 468,527 |
| | $ | 728,711 |
| Gross profit | | $ | 188,767 |
| | $ | 146,521 |
| | $ | 151,538 |
| | $ | 255,813 |
| Net income | | $ | 42,073 |
| | $ | 15,829 |
| | $ | 17,422 |
| | $ | 63,943 |
| Earnings per basic share | | $ | 0.47 |
| | $ | 0.18 |
| | $ | 0.20 |
| | $ | 0.75 |
| Earnings per diluted share | | $ | 0.47 |
| | $ | 0.18 |
| | $ | 0.20 |
| | $ | 0.75 |
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| | | | | | | | | | | | | | | | | | 2011 Quarter | | First | | Second | | Third | | Fourth | | | (in thousands, except per share amounts) | Net sales | | $ | 467,377 |
| | $ | 446,041 |
| | $ | 486,784 |
| | $ | 673,153 |
| Gross profit | | $ | 178,314 |
| | $ | 149,832 |
| | $ | 175,968 |
| | $ | 250,347 |
| Net income | | $ | 35,013 |
| | $ | 12,620 |
| | $ | 32,670 |
| | $ | 60,394 |
| Earnings basic share | | $ | 0.40 |
| | $ | 0.14 |
| | $ | 0.37 |
| | $ | 0.68 |
| Earnings per diluted share | | $ | 0.39 |
| | $ | 0.14 |
| | $ | 0.37 |
| | $ | 0.68 |
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