Condensed Consolidated Statements of Net Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Net sales	$ 417,813	$ 285,441
Cost of sales	268,190	171,791
Gross profit	149,623	113,650
Selling, general, and administrative expenses	77,514	46,703
Research and development expenses	22,540	12,151
Amortization of intangibles	11,998	5,944
Total operating expenses	112,052	64,798
Operating income	37,571	48,852
Interest expense	5,423	3,120
Foreign exchange gain	(10,555)	(1,557)
Other (income) expense, net	(1,943)	(139)
Income before income taxes	44,646	47,428
Income taxes	8,617	8,537
Net income	$ 36,029	$ 38,891
Income per share:
Basic (in dollars per share)	$ 1.48	$ 1.71
Diluted (in dollars per share)	$ 1.45	$ 1.69
Weighted-average shares and equivalent shares outstanding:
Basic (in shares)	24,339	22,748
Diluted (in shares)	24,775	22,989
Cash dividends declared per common share (in dollars per share)	$ 0.37	$ 0.33