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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 243,260,000 | $ 240,455,000 | $ 213,276,000 | $ 215,389,000 | $ 205,522,000 | $ 216,766,000 | $ 211,489,000 | $ 210,971,000 | $ 912,380,000 | $ 844,748,000 | $ 879,577,000
Gross profit | 60,911,000 | 64,939,000 | 54,679,000 | 54,164,000 | 47,933,000 | 54,711,000 | 52,178,000 | 50,277,000 | 234,693,000 | 205,099,000 | 202,448,000
Net income | $ 3,240,000 | $ 16,592,000 | $ 12,316,000 | $ 12,167,000 | $ 7,588,000 | $ 13,236,000 | $ 10,562,000 | $ 8,659,000 | $ 44,315,000 | $ 40,045,000 | $ 43,209,000
Per common share - diluted |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.27 | $ 1.42 | $ 1.05 | $ 1.05 | $ 0.65 | $ 1.14 | $ 0.92 | $ 0.75 | $ 3.79 | $ 3.46 | $ 3.76
Average shares |  |  |  |  |  |  |  |  |  |  |
Diluted (in shares) | 11,727 | 11,708 | 11,671 | 11,620 | 11,608 | 11,595 | 11,550 | 11,507 | 11,682 | 11,565 | 11,482
Dividends per share (in dollars per share) | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Estimated foreign earnings and profits tax expense | $ 10,100,000 |  |  |  |  |  |  |  | $ 13,104,000 |  |
High |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 119.5 | 107.69 | 92.67 | 79.50 | 78.91 | 68.04 | 66.01 | 61.82 | $ 119.5 | $ 78.91 |
Low |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 104.87 | $ 86.8 | $ 71.72 | $ 71.20 | $ 59.55 | $ 61.49 | $ 52.82 | $ 48.26 | $ 104.87 | $ 59.55 |

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