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Quarterly Results (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
Net income (loss) and earnings (loss) per share                      
Net sales $ 391,389 $ 404,354 $ 384,693 $ 397,352 $ 391,905 $ 416,493 $ 397,985 $ 396,771 $ 1,577,788 $ 1,603,154 $ 1,455,331
Gross profit 52,609 59,192 40,878 60,970 53,610 54,916 37,500 60,167 213,649 206,193 186,247
Net income loss $ 6,970 $ 20,099 $ 13,432 $ 18,878 $ 9,741 $ 13,026 $ 2,501 $ 17,426      
Diluted $ 0.16 $ 0.46 $ 0.31 $ 0.43 $ 0.22 $ 0.28 $ 0.05 $ 0.38 $ 1.36 $ 0.93 $ 1.17