Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 54,158	$ 38,103
Short-term investments	101,870	144,431
Accounts receivable, less reserves of $1,130 and $1,240 in 2012 and 2011, respectively	44,761	48,206
Inventories	24,995	28,098
Deferred income taxes	6,785	6,880
Prepaid expenses and other current assets	17,657	19,628
Total current assets	250,226	285,346
Long-term investments	259,910	174,906
Property, plant, and equipment, net	34,344	31,744
Deferred income taxes	17,378	15,919
Intangible assets, net	15,783	18,910
Goodwill	81,689	82,029
Other assets	2,785	3,027
Total assets	662,115	611,881
Current liabilities:
Accounts payable	7,567	7,098
Accrued expenses	28,918	32,290
Accrued income taxes	3,583	1,259
Deferred revenue and customer deposits	11,755	13,458
Total current liabilities	51,823	54,105
Reserve for income taxes	4,890	4,796
Commitments and contingencies (Note 7)
Shareholders' equity:
Common stock, $.002 par value - Authorized: 140,000 shares, issued: 42,961 and 42,223 shares in 2012 and 2011, respectively	86	84
Additional paid-in capital	161,296	135,668
Retained earnings	472,729	434,581
Accumulated other comprehensive loss, net of tax	(28,709)	(17,353)
Total shareholders' equity	605,402	552,980
Total liabilities and shareholders' equity	$ 662,115	$ 611,881