Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Dec. 30, 2012
Current assets:
Cash and cash equivalents	$ 182,724	$ 203,364
Short term investments	3,750	3,970
Accounts receivable, net	120,009	98,467
Inventories	67,665	71,948
Income taxes receivable	5,575	4,925
Deferred income taxes, net	7,945	7,935
Other current assets	13,481	14,299
Total current assets	401,149	404,908
Property, plant and equipment, net	186,777	147,544
Investment in and advances to unconsolidated affiliate	4,638	4,638
Non-current deferred income taxes, net	17,289	17,038
Non-current assets	29,133	25,473
Total assets	638,986	599,601
Current liabilities:
Accounts payable	33,366	32,400
Accrued expenses	48,916	34,178
Total current liabilities	82,282	66,578
Non-current income tax liabilities	12,255	11,328
Non-current deferred income tax liabilities, net	18,969	18,876
Other non-current liabilities	38,500	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 - 27,495,956 shares, (27,295,488 shares at December 30, 2012)	75,046	71,819
Accumulated other comprehensive loss	(61,646)	(62,614)
Retained earnings	473,580	457,700
Total shareholders' equity	486,980	466,905
Total liabilities and shareholders' equity	$ 638,986	$ 599,601