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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Financial Data [Abstract]      
Schedule Of Quarterly Financial Information
    2011 Quarter  
(in thousands, except per share data)   1st     2nd     3rd     4th  
                         
Sales   $ 538,312     $ 585,549     $ 570,083     $ 559,086  
Gross profit     37,624       37,751       34,635       28,825  
Net income     14,513       14,701       19,867       2,878  
Earnings per common share:                                
   Basic     0.24       0.24       0.34       0.05  
   Diluted     0.24       0.24       0.34       0.05  
    2010 Quarter  
(in thousands, except per share data)   1st     2nd     3rd     4th  
                         
Sales   $ 571,905     $ 589,449     $ 613,864     $ 626,925  
Gross profit     45,237       46,254       47,192       48,732  
Net income     18,142       20,137       22,469       19,010  
Earnings per common share:                                
   Basic     0.29       0.32       0.36       0.31  
   Diluted     0.28       0.32       0.36       0.31  
    2009 Quarter  
(in thousands, except per share data)   1st     2nd     3rd     4th  
                         
Sales   $ 496,767     $ 481,802     $ 510,461     $ 600,223  
Gross profit     31,636       34,500       36,534       43,395  
Net income     9,238       11,501       16,137       16,505  
Earnings per common share:                                
   Basic     0.14       0.18       0.25       0.26  
   Diluted     0.14       0.18       0.25       0.25