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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 165,605 | $ 174,738 | $ 178,064 | $ 158,429 | $ 149,404 | $ 156,078 | $ 167,009 | $ 155,911 |  |  |
Gross profit | 36,351 | 43,156 | 44,091 | 34,912 | 32,043 | 37,070 | 39,161 | 35,238 | 158,510 | 143,512 | 135,085
Net income | $ 6,024 | $ 11,333 | $ 11,787 | $ 6,950 | $ 4,199 | $ 8,575 | $ 9,344 | $ 6,785 | $ 36,094 | $ 28,903 | $ 32,687
Per common share - diluted |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.49 | $ 0.93 | $ 0.97 | $ 0.57 | $ 0.35 | $ 0.71 | $ 0.77 | $ 0.56 | $ 2.96 | $ 2.40 | $ 2.73
Average shares |  |  |  |  |  |  |  |  |  |  |
Diluted (in shares) | 12,262 | 12,229 | 12,200 | 12,158 | 12,090 | 12,056 | 12,058 | 12,027 | 12,212,000 | 12,058,000 | 11,966,000
Dividends per share (in dollars per share) | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | $ 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) | $ 61.27 | $ 49.45 | $ 44.13 | $ 40.64 | $ 34.63 | $ 34.00 | $ 34.23 | $ 30.93 | $ 61.27 | $ 34.63 |
Low |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 45.51 | $ 40.48 | $ 37.39 | $ 33.12 | $ 29.66 | $ 27.07 | $ 29.40 | $ 25.51 | $ 45.51 | $ 29.66 |

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