Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 16,041	$ (981)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant and equipment	(6,110)	(14,983)
Proceeds from sales and maturities of investments	200	200
Purchase of investments	0	(200)
Proceeds from sale of property, plant and equipment	1	1,758
Other	0	37
NET CASH USED IN INVESTING ACTIVITIES	(5,909)	(13,188)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	(4,676)	(4,791)
Payments for Repurchase of Common Stock	(11,928)	(2,069)
Proceeds from exercise of stock options	179	3,871
Excess tax benefits from exercise of stock options	0	192
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(16,425)	(2,797)
Effect of exchange rate changes on cash	(219)	(810)
Net decrease in cash and cash equivalents	(6,512)	(17,776)
Cash and cash equivalents at the beginning of the period	52,036	62,451
Cash and cash equivalents at the end of period	$ 45,524	$ 44,675