Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 40,172	$ 40,644
Short-term investments	83,677	184,822
Accounts receivable, less reserves of $1,214 and $1,354 in 2014 and 2013, respectively	69,780	53,015
Inventories	30,737	25,694
Deferred income taxes	7,829	7,611
Deferred costs	20,877	4,688
Prepaid expenses and other current assets	15,184	15,577
Total current assets	268,256	332,051
Long-term investments	343,725	229,655
Property, plant, and equipment, net	38,321	37,136
Deferred income taxes	13,535	12,307
Intangible assets, net	12,892	14,723
Goodwill	81,689	81,689
Other assets	2,038	2,138
Total assets	760,456	709,699
Current liabilities:
Accounts payable	15,329	9,487
Accrued expenses	32,921	34,331
Accrued income taxes	569	1,263
Deferred revenue	25,327	15,941
Total current liabilities	74,146	61,022
Reserve for income taxes	3,803	4,765
Commitments and contingencies (Note 8)
Shareholders' equity:
Common stock, $.002 par value – Authorized: 140,000 shares, issued and outstanding: 86,739 and 86,831 shares in 2014 and 2013, respectively	174	174
Additional paid-in capital	231,907	211,440
Retained earnings	479,581	462,131
Accumulated other comprehensive loss, net of tax	(29,155)	(29,833)
Total shareholders’ equity	682,507	643,912
Total liabilities and shareholders' equity	$ 760,456	$ 709,699