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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except 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
Schedule of Quarterly Financial Information Disclosure [Line Items]                      
Sales $ 149,404 $ 156,078 $ 167,009 $ 155,911 $ 146,997 $ 155,057 $ 160,824 $ 140,715      
Gross profit 32,043 37,070 39,161 35,238 28,570 37,223 37,391 31,901 143,512 135,085 116,914
Net income $ 4,199 $ 8,575 $ 9,344 $ 6,785 $ 8,050 $ 10,056 $ 8,914 $ 5,667 $ 28,903 $ 32,687 $ 21,117
Per common share - diluted                      
Diluted (in dollars per share) $ 0.35 $ 0.71 $ 0.77 $ 0.56 $ 0.67 $ 0.84 $ 0.74 $ 0.47 $ 2.40 $ 2.73 $ 1.78
Average shares                      
Diluted (in shares) 12,090 12,056 12,058 12,027 11,973 11,947 11,966 11,980 12,058,000 11,966,000 11,893,000
Dividends per share (in dollars per share) $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.24 $ 0.24 $ 0.24
High
                      
Market price of common stock                      
Share Price (in dollars per share) $ 34.63 $ 34.00 $ 34.23 $ 30.93 $ 29.20 $ 25.05 $ 28.87 $ 29.27 $ 34.63 $ 29.20  
Low
                      
Market price of common stock                      
Share Price (in dollars per share) $ 29.66 $ 27.07 $ 29.40 $ 25.51 $ 19.71 $ 20.35 $ 21.09 $ 25.32 $ 29.66 $ 19.71