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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 288,624 | $ 291,759 | $ 268,635 | $ 314,448 | $ 300,189 | $ 271,829 | $ 285,186 | $ 261,934 | $ 1,163,466 | $ 1,119,138 | $ 1,008,822
Gross profit | 66,709 | 78,636 | 67,825 | 78,940 | 68,076 | 68,710 | 73,133 | 63,308 | 292,110 | 273,227 | 256,115
Net income | $ 8,080 | $ 20,033 | $ 12,989 | $ 15,528 | $ 9,568 | $ 17,418 | $ 20,667 | $ 15,253 | $ 56,630 | $ 62,906 | $ 73,486
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.68 | $ 1.69 | $ 1.10 | $ 1.31 | $ 0.81 | $ 1.47 | $ 1.75 | $ 1.30 | $ 4.78 | $ 5.33 | $ 6.25
Average shares |  |  |  |  |  |  |  |  |  |  |
Diluted (in shares) | 11,859 | 11,851 | 11,842 | 11,827 | 11,811 | 11,813 | 11,798 | 11,777 | 11,845 | 11,800 | 11,761
Dividends per share (in dollars per share) | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 |  |  |
High |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | 144.75 | 116.67 | 117.35 | 131.87 | 129.74 | 124.33 | 106.19 | 101.58 | $ 144.75 | $ 129.74 |
Low |  |  |  |  |  |  |  |  |  |  |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 105.89 | $ 94.90 | $ 76.04 | $ 70.99 | $ 103.60 | $ 93.11 | $ 93.00 | $ 74.74 | $ 105.89 | $ 103.60 |

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