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Quarterly Results of Operations (Unaudited) (Results of Operations) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 210,672 | $ 201,944 | $ 191,157 | $ 198,810 | $ 193,768 | $ 221,842 | $ 242,852 | $ 239,798 | $ 802,583 | $ 898,260 | $ 879,091
Gross margin | 80,703 | 75,518 | 69,969 | 65,630 | 64,203 | 78,867 | 85,828 | 85,394 | $ 291,820 | $ 314,292 | $ 310,783
Net income (loss) | $ 15,205 | $ 7,006 | $ 14,520 | $ 13,259 | $ (28,760) | $ 23,387 | $ 24,293 | $ 28,399 |  |  |
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.82 | $ 0.37 | $ 0.78 | $ 0.71 | $ (1.55) | $ 1.26 | $ 1.31 | $ 1.53 |  |  |
Diluted (in dollars per share) | $ 0.81 | $ 0.37 | $ 0.78 | $ 0.71 | $ (1.55) | $ 1.25 | $ 1.30 | $ 1.52 |  |  |

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