Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$ (12,631)	$ 9,981
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant and equipment	(7,753)	(4,288)
Proceeds from life insurance policy	297	1,726
Proceeds from sales and maturities of investments	200	335
Purchase of investments	(200)	(8)
Other	4	56
NET CASH USED IN INVESTING ACTIVITIES	(7,452)	(2,179)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	0	(4,347)
Proceeds from exercise of stock options	431	367
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	431	(3,980)
Effect of exchange rate changes on cash	2,458	1,540
Net (decrease) increase in cash and cash equivalents	(17,194)	5,362
Cash and cash equivalents at the beginning of the period	203,364	187,795
Cash and cash equivalents at the end of period	$ 186,170	$ 193,157