Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 20,684	$ 48,156
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant and equipment	(43,408)	(14,265)
Proceeds from life insurance policy	297	1,726
Proceeds from sales and maturities of investments	3,970	4,092
Purchase of investments	(3,750)	(3,978)
Proceeds from sale of property, plant and equipment	13	2,061
Premiums paid for life insurance	(347)	(352)
Other	0	104
NET CASH USED IN INVESTING ACTIVITIES	(43,225)	(10,612)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	0	(13,063)
Proceeds from exercise of stock options	1,515	810
Excess tax benefits from exercise of stock options	322	0
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	1,837	(12,253)
Effect of exchange rate changes on cash	64	1,808
Net (decrease) increase in cash and cash equivalents	(20,640)	27,099
Cash and cash equivalents at the beginning of the period	203,364	187,795
Cash and cash equivalents at the end of period	$ 182,724	$ 214,894