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Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2009
Jun. 30, 2009
Mar. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Financial Data [Abstract]                              
Sales $ 559,086 $ 570,083 $ 585,549 $ 538,312 $ 626,925 $ 613,864 $ 589,449 $ 571,905 $ 600,223 $ 510,461 $ 481,802 $ 496,767 $ 2,253,030 $ 2,402,143 $ 2,089,253
Gross profit 28,825 34,635 37,751 37,624 48,732 47,192 46,254 45,237 43,395 36,534 34,500 31,636 138,835 187,415 146,065
Net income $ 2,878 $ 19,867 $ 14,701 $ 14,513 $ 19,010 $ 22,469 $ 20,137 $ 18,142 $ 16,505 $ 16,137 $ 11,501 $ 9,238 $ 51,959 $ 79,758 $ 53,381
Earnings per common share, Basic $ 0.05 $ 0.34 $ 0.24 $ 0.24 $ 0.31 $ 0.36 $ 0.32 $ 0.29 $ 0.26 $ 0.25 $ 0.18 $ 0.14 $ 0.88 $ 1.28 $ 0.82
Earnings per common share, Diluted $ 0.05 $ 0.34 $ 0.24 $ 0.24 $ 0.31 $ 0.36 $ 0.32 $ 0.28 $ 0.25 $ 0.25 $ 0.18 $ 0.14 $ 0.87 $ 1.27 $ 0.82