Consolidated Balance Sheets (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 42,676	$ 33,203
Short-term investments	202,012	147,823
Accounts receivable, less reserves of $1,248 and $1,235 in 2011 and 2010, respectively	42,480	45,901
Inventories	27,004	22,717
Deferred income taxes	6,319	6,302
Prepaid expenses and other current assets	21,810	23,059
Total current assets	342,301	279,005
Long-term investments	108,700	102,055
Property, plant, and equipment, net	30,590	29,596
Deferred income taxes	15,707	15,555
Intangible assets, net	21,047	23,130
Goodwill	82,654	82,204
Other assets	1,658	1,559
Total assets	602,657	533,104
Current liabilities:
Accounts payable	6,922	7,153
Accrued expenses	27,941	29,346
Accrued income taxes	8,726	7,771
Deferred revenue and customer deposits	13,089	10,162
Total current liabilities	56,678	54,432
Reserve for income taxes	5,694	5,361
Commitments and contingencies (Note 8)
Shareholders' equity:
Common stock, $.002 par value - Authorized: 140,000 shares, issued: 42,065 and 41,065 shares in 2011 and 2010, respectively	84	82
Additional paid-in capital	130,171	102,620
Retained earnings	405,463	379,826
Accumulated other comprehensive gain (loss), net of tax	4,567	(9,217)
Total shareholders' equity	540,285	473,311
Total liabilities and shareholders' equity	$ 602,657	$ 533,104