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Quarterly Results (Unaudited) (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 16, 2014 | Jul. 02, 2013 | Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Sep. 30, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Mar. 31, 2014 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | $ 97,229 | $ 94,360 | $ 90,275 | $ 76,768 | $ 84,728 | $ 102,917 | $ 92,310 | $ 76,367 | $ 358,632 | $ 356,322 | $ 321,140
Gross profit |  |  | 29,581 | 30,185 | 27,117 | 21,798 | 25,191 | 33,350 | 27,876 | 21,846 | 108,681 | 108,263 | 89,792
Net income |  |  | $ 12,948 | $ 13,251 | $ 11,130 | $ 8,399 | $ 10,533 | $ 12,440 | $ 11,363 | $ 9,822 | $ 45,728 | $ 44,158 | $ 37,547
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ / shares |  |  | $ 0.24 | $ 0.24 | $ 0.21 | $ 0.16 | $ 0.19 | $ 0.23 | $ 0.21 | $ 0.18 | $ 0.85 | $ 0.81 | $ 0.68
Diluted (usd per share) | $ / shares |  |  | $ 0.24 | $ 0.24 | $ 0.20 | $ 0.15 | $ 0.19 | $ 0.22 | $ 0.20 | $ 0.17 | $ 0.84 | $ 0.80 | $ 0.68
Stock split, conversion ratio | 1.5 | 1.5 |  |  |  |  |  |  |  |  |  |  |

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