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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenues $ 859,634 $ 796,392 $ 763,520
Cost of sales 390,524 365,351 355,190
Gross profit 469,110 431,041 408,330
Selling and administrative expense 355,617 351,799 338,400
Research and development expense 42,188 32,307 32,254
Total operating expenses 397,805 384,106 370,654
Income from operations 71,305 46,935 37,676
Other expense 0 0 2,942
Interest expense 20,652 18,203 15,359
Income before income taxes 50,653 28,732 19,375
Provision (benefit) for income taxes 9,799 (26,755) 4,711
Net income $ 40,854 $ 55,487 $ 14,664
Earnings per share:      
Basic (in dollars per share) $ 1.45 $ 1.99 $ 0.53
Diluted (in dollars per share) $ 1.41 $ 1.97 $ 0.52
Other comprehensive income (loss), before tax:      
Foreign currency translation adjustments $ (8,369) $ 13,879 $ (4,501)
Pension liability (885) 1,023 (755)
Cash flow hedging gain (loss) 10,985 (8,051) 547
Other comprehensive income, before tax 42,585 62,338 9,955
Provision (benefit) for income taxes related to items of other comprehensive income 2,441 (2,597) (77)
Comprehensive income $ 40,144 $ 64,935 $ 10,032