v2.4.0.6
Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of the unaudited quarterly financial information                      
Net sales $ 258,000 $ 269,152 $ 264,730 $ 280,466 $ 248,297 $ 319,356 $ 309,469 $ 303,351 $ 1,072,348 $ 1,180,474 $ 910,222
Gross profit 22,339 24,136 19,391 24,461 38,627 37,839 30,632 33,755 90,327 140,855 82,409
Net income (loss) $ 5,520 $ 5,527 $ 2,370 $ 6,694 $ 16,295 $ 13,721 $ 9,461 $ 10,654 $ 19,811 $ 50,131 $ 15,290
Net income (loss) per common share - basic $ 0.25 $ 0.27 $ 0.11 $ 0.29 $ 0.70 $ 0.59 $ 0.41 $ 0.46 $ 0.91 $ 2.15 $ 0.66
Net income (loss) per common share - diluted $ 0.25 $ 0.27 $ 0.11 $ 0.29 $ 0.69 $ 0.59 $ 0.40 $ 0.46 $ 0.91 $ 2.14 $ 0.66