Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 38,179	$ 40,644
Short-term investments	49,758	184,822
Accounts receivable, less reserves of $1,184 and $1,354 in 2014 and 2013, respectively	99,949	53,015
Inventories	31,210	25,694
Unbilled revenue	13,292	1,793
Deferred income taxes	8,329	7,611
Prepaid expenses and other current assets	17,032	18,472
Total current assets	257,749	332,051
Long-term investments	409,283	229,655
Property, plant, and equipment, net	39,318	37,136
Deferred income taxes	14,846	12,307
Intangible assets, net	11,789	14,723
Goodwill	81,689	81,689
Other assets	1,728	2,138
Total assets	816,402	709,699
Current liabilities:
Accounts payable	13,302	9,487
Accrued expenses	39,503	34,331
Accrued income taxes	1,450	1,263
Deferred revenue	24,253	15,941
Total current liabilities	78,508	61,022
Reserve for income taxes	3,942	4,765
Commitments and contingencies (Note 8)
Shareholders' equity:
Common stock, $.002 par value – Authorized: 140,000 shares, issued and outstanding: 87,045 and 86,831 shares in 2014 and 2013, respectively	174	174
Additional paid-in capital	245,687	211,440
Retained earnings	521,845	462,131
Accumulated other comprehensive loss, net of tax	(33,754)	(29,833)
Total shareholders’ equity	733,952	643,912
Total liabilities and shareholders' equity	$ 816,402	$ 709,699