Consolidated Balance Sheets - USD ($)	Oct. 02, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 61,145,000	$ 51,975,000
Short-term investments	328,378,000	296,468,000
Accounts receivable, less reserves of $800 and $736 in 2016 and 2015, respectively	82,068,000	42,846,000
Unbilled revenue	10,090,000	24,000
Inventories	27,226,000	37,334,000
Prepaid expenses and other current assets	21,921,000	15,847,000
Total current assets	530,828,000	444,494,000
Long-term investments	315,927,000	273,088,000
Property, plant, and equipment, net	55,730,000	53,285,000
Goodwill	82,831,000	81,448,000
Intangible assets, net	4,716,000	6,315,000
Deferred income taxes	27,529,000	26,517,000
Other assets	2,526,000	2,609,000
Total assets	1,020,087,000	887,756,000
Current liabilities:
Accounts payable	10,106,000	7,860,000
Accrued expenses	42,593,000	33,272,000
Accrued income taxes	470,000	985,000
Deferred revenue and customer deposits	15,905,000	11,571,000
Total current liabilities	69,074,000	53,688,000
Deferred income taxes	346,000	319,000
Reserve for income taxes	5,104,000	4,830,000
Other non-current liabilities	1,615,000	3,252,000
Total liabilities	76,139,000	62,089,000
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 200,000 and 140,000 shares in 2016 and 2015, respectively, issued and outstanding: 85,666 and 84,856 shares in 2016 and 2015, respectively	171,000	170,000
Additional paid-in capital	349,981,000	311,008,000
Retained earnings	640,230,000	566,613,000
Accumulated other comprehensive loss, net of tax	(46,434,000)	(52,124,000)
Total shareholders’ equity	943,948,000	825,667,000
Total liabilities and shareholders' equity	$ 1,020,087,000	$ 887,756,000