Consolidated Statements of Net Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Revenue, Net	[1]	$ 271,912	$ 222,021	$ 491,310	$ 432,334
Cost of sales		174,046	136,740	306,289	270,723
Gross profit		97,866	85,281	185,021	161,611
Selling, general and administrative expenses		51,092	38,772	93,458	75,117
Research and development expenses		11,916	7,361	20,481	14,745
Amortization of intangibles		5,156	2,977	8,952	6,030
		68,164	49,110	122,891	95,892
Operating income		29,702	36,171	62,130	65,719
Interest expense		1,670	948	3,715	2,099
Foreign exchange (gain) loss		(6,237)	(1,292)	(2,414)	1,825
Other (income) expense, net		255	(1,202)	(262)	(2,328)
Income before income taxes		34,014	37,717	61,091	64,123
Income taxes		6,862	9,033	14,650	15,444
Net income		$ 27,152	$ 28,684	$ 46,441	$ 48,679
Net income per share (see Note 9):
Basic (in dollars per share)		$ 1.21	$ 1.26	$ 2.07	$ 2.15
Diluted (in dollars per share)		$ 1.20	$ 1.26	$ 2.05	$ 2.13
Weighted average shares and equivalent shares outstanding:
Basic (in shares)		22,528	22,691	22,483	22,645
Diluted (in shares)		22,674	22,835	22,647	22,810
Cash dividends paid per common share (in dollars per share)		$ 0.29	$ 0.25	$ 0.58	$ 0.50

[1] Sales by country represent sale to customer or distributor locations.