Consolidated Statements of Net Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Revenue, Net	[1]	$ 280,331	$ 215,510	$ 771,641	$ 647,844
Cost of sales		166,572	129,328	472,861	400,051
Gross profit		113,759	86,182	298,780	247,793
Selling, general and administrative expenses		56,589	37,002	150,047	112,119
Research and development expenses		10,403	7,479	30,884	22,224
Pension settlement expense			30,194		30,194
Amortization of intangibles		4,432	2,923	13,384	8,952
Impairment of goodwill and intangible assets		14,809		14,809
		86,233	77,598	209,124	173,490
Operating income		27,526	8,584	89,656	74,303
Interest expense		2,571	922	6,286	3,021
Foreign exchange (gain) loss		(4,700)	(3,549)	(7,114)	(1,724)
Other (income) expense, net		(778)	(1,430)	(1,040)	(3,758)
Income before income taxes		30,433	12,641	91,524	76,764
Income taxes		(369)	1,317	14,281	16,761
Net income		$ 30,802	$ 11,324	$ 77,243	$ 60,003
Net income per share (see Note 10):
Basic (in dollars per share)		$ 1.36	$ 0.50	$ 3.43	$ 2.65
Diluted (in dollars per share)		$ 1.35	$ 0.50	$ 3.41	$ 2.64
Weighted average shares and equivalent shares outstanding:
Basic (in shares)		22,578	22,581	22,515	22,623
Diluted (in shares)		22,734	22,693	22,675	22,771
Cash dividends paid per common share (in dollars per share)		$ 0.33	$ 0.29	$ 0.91	$ 0.79

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