Consolidated Statements of Net Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Net sales	[1]	$ 215,510	$ 217,608	$ 647,844	$ 645,375
Cost of sales		129,328	130,228	400,051	396,506
Gross profit		86,182	87,380	247,793	248,869
Selling, general and administrative expenses		37,002	36,647	112,119	109,146
Research and development expenses		7,479	$ 7,449	22,224	$ 22,833
Pension settlement expense		30,194		30,194
Amortization of intangibles		2,923	$ 3,154	8,952	$ 9,451
		77,598	47,250	173,490	141,430
Operating income		8,584	40,130	74,303	107,439
Interest expense		922	1,292	3,021	3,736
Foreign exchange (gain) loss		(3,549)	(101)	(1,724)	2,022
Other (income) expense, net		(1,430)	(2,261)	(3,758)	(4,893)
Income before income taxes		12,641	41,200	76,764	106,574
Income taxes		1,317	11,260	16,761	26,667
Net income		$ 11,324	$ 29,940	$ 60,003	$ 79,907
Net income per share (see Note 7):
Basic (in dollars per share)		$ 0.50	$ 1.33	$ 2.65	$ 3.55
Diluted (in dollars per share)		$ 0.50	$ 1.32	$ 2.64	$ 3.52
Weighted average shares and equivalent shares outstanding:
Basic (in shares)		22,581	22,536	22,623	22,536
Diluted (in shares)		22,693	22,689	22,771	22,722
Cash dividends paid per common share (in dollars per share)		$ 0.29	$ 0.25	$ 0.79	$ 0.69

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