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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Net sales | $ 796,392 | $ 763,520 | $ 719,168
Cost of sales | 365,351 | 355,190 | 337,466
Gross profit | 431,041 | 408,330 | 381,702
Selling and administrative expense | 351,799 | 338,400 | 303,091
Research and development expense | 32,307 | 32,254 | 27,436
Total operating expenses | 384,106 | 370,654 | 330,527
Income from operations | 46,935 | 37,676 | 51,175
Other expense | 0 | 2,942 | 0
Interest expense | 18,203 | 15,359 | 6,031
Income before income taxes | 28,732 | 19,375 | 45,144
Provision (benefit) for income taxes | (26,755) | 4,711 | 14,646
Net income | $ 55,487 | $ 14,664 | $ 30,498
Earnings per share: |  |  |
Basic (in dollars per share) | $ 1.99 | $ 0.53 | $ 1.10
Diluted (in dollars per share) | 1.97 | 0.52 | 1.09
Dividends per share of common stock (in dollars per share) | $ 0.80 | $ 0.80 | $ 0.80
Other comprehensive income (loss), before tax: |  |  |
Foreign currency translation adjustments | $ 13,879 | $ (4,501) | $ (16,775)
Pension liability | 1,023 | (755) | 7,578
Cash flow hedging gain (loss) | (8,051) | 547 | (3,291)
Other comprehensive income, before tax | 62,338 | 9,955 | 18,010
Provision (benefit) for income taxes related to items of other comprehensive income | (2,597) | (77) | 1,584
Comprehensive income | $ 64,935 | $ 10,032 | $ 16,426

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