Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 30, 2012
Current assets:
Cash and cash equivalents	$ 202,536	$ 203,364
Short term investments	3,970	3,970
Accounts receivable, net	106,582	98,467
Inventories	70,198	71,948
Income taxes receivable	4,460	4,925
Deferred income taxes, net	7,904	7,935
Other current assets	13,166	14,299
Total current assets	408,816	404,908
Property, plant and equipment, net	149,804	147,544
Investment in and advances to unconsolidated affiliate	4,638	4,638
Non-current deferred income taxes, net	17,307	17,038
Non-current assets	29,607	25,473
Total assets	610,172	599,601
Current liabilities:
Accounts payable	32,245	32,400
Accrued expenses	29,005	34,178
Total current liabilities	61,250	66,578
Non-current income tax liabilities	11,730	11,328
Non-current deferred income tax liabilities, net	18,663	18,876
Other non-current liabilities	39,522	35,914
Commitments and contingencies (Note 14)	0	0
Shareholders' equity:
Preferred stock, no par value, Authorized - 1,000,000 shares, Issued - none	0	0
Common stock, no par value, Authorized - 100,000,000 shares, Issued and outstanding - 27,322,363 shares, (27,295,488 shares at December 30, 2012)	74,187	71,819
Accumulated other comprehensive loss	(64,138)	(62,614)
Retained earnings	468,958	457,700
Total shareholders' equity	479,007	466,905
Total liabilities and shareholders' equity	$ 610,172	$ 599,601