CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 55,694	$ 40,644
Short-term investments	90,456	184,822
Accounts receivable, less reserves of $1,095 and $1,354 in 2014 and 2013, respectively	50,938	53,015
Inventories	35,536	25,694
Deferred income taxes	8,985	7,611
Prepaid expenses and other current assets	22,997	20,265
Total current assets	264,606	332,051
Long-term investments	400,845	229,655
Property, plant, and equipment, net	47,907	37,136
Deferred income taxes	14,452	12,307
Intangible assets, net	10,699	14,723
Goodwill	81,689	81,689
Other assets	1,536	2,138
Total assets	821,734	709,699
Current liabilities:
Accounts payable	19,114	9,487
Accrued expenses	39,949	34,331
Accrued income taxes	1,048	1,263
Deferred revenue and customer deposits	20,563	15,941
Total current liabilities	80,674	61,022
Reserve for income taxes	4,623	4,765
Commitments and contingencies (Note 10)
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 140,000 shares, issued and outstanding: 86,542 and 86,831 shares in 2014 and 2013, respectively	173	174
Additional paid-in capital	251,717	211,440
Retained earnings	523,946	462,131
Accumulated other comprehensive loss, net of tax	(39,399)	(29,833)
Total shareholders’ equity	736,437	643,912
Total liabilities and shareholders' equity	$ 821,734	$ 709,699