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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 224,431 | $ 231,614 | $ 215,734 | $ 207,798 | $ 223,911 | $ 234,783 | $ 207,751 | $ 172,610 |  |  |
Gross profit | 48,737 | 57,509 | 50,665 | 45,537 | 48,372 | 55,440 | 47,286 | 38,130 | $ 202,448 | $ 189,228 | $ 158,510
Net income | $ 11,384 | $ 14,756 | $ 9,710 | $ 7,359 | $ 11,351 | $ 13,367 | $ 9,195 | $ 7,238 | $ 43,209 | $ 41,151 | $ 36,094
Per common share - diluted |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.99 | $ 1.28 | $ 0.84 | $ 0.64 | $ 1.00 | $ 1.10 | $ 0.75 | $ 0.59 | $ 3.76 | $ 3.42 | $ 2.96
Average shares |  |  |  |  |  |  |  |  |  |  |
Diluted (in shares) | 11,500 | 11,496 | 11,498 | 11,436 | 11,403 | 12,205 | 12,276 | 12,270 | 11,482 | 12,039 | 12,212
Dividends per share (in dollars per share) | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 |  |  |
High |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | 57.51 | 55.12 | 64.45 | 63.39 | 52.13 | 55.84 | 57.86 | 60.65 | $ 57.51 | $ 52.13 |
Low |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 43.98 | $ 44.48 | $ 48.1 | $ 44.74 | $ 37.93 | $ 40.75 | $ 49.50 | $ 46.87 | $ 43.98 | $ 37.93 |

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