Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Oct. 02, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 30,175	$ 33,203
Short-term investments	142,409	147,823
Accounts receivable, less reserves of $1,190 and $1,235 in 2011 and 2010, respectively	45,827	45,901
Inventories	28,595	22,717
Deferred income taxes	6,498	6,302
Prepaid expenses and other current assets	20,835	23,059
Total current assets	274,339	279,005
Long-term investments	173,521	102,055
Property, plant, and equipment, net	30,869	29,596
Deferred income taxes	15,814	15,555
Intangible assets, net	19,969	23,130
Goodwill	82,277	82,204
Other assets	1,718	1,559
Total assets	598,507	533,104
Current liabilities:
Accounts payable	7,388	7,153
Accrued expenses	30,296	29,346
Accrued income taxes	2,006	7,771
Deferred revenue and customer deposits	13,165	10,162
Total current liabilities	52,855	54,432
Reserve for income taxes	4,291	5,361
Commitments and contingencies (Note 8)
Shareholders' equity:
Common stock, $.002 par value - Authorized: 140,000 shares, issued: 42,075 and 41,065 shares in 2011 and 2010, respectively	84	82
Additional paid-in capital	129,845	102,620
Retained earnings	419,699	379,826
Accumulated other comprehensive loss, net of tax	(8,267)	(9,217)
Total shareholders' equity	541,361	473,311
Total liabilities and shareholders' equity	$ 598,507	$ 533,104