Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 03, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 54,929	$ 51,975
Short-term investments	294,593	296,468
Accounts receivable, less reserves of $802 and $736 in 2016 and 2015, respectively	61,219	42,846
Unbilled revenue	25,500	24
Inventories	25,882	37,334
Prepaid expenses and other current assets	23,601	15,847
Total current assets	485,724	444,494
Long-term investments	307,703	273,088
Property, plant, and equipment, net	53,406	53,285
Goodwill	81,448	81,448
Intangible assets, net	4,453	6,315
Deferred income taxes	29,083	26,517
Other assets	2,623	2,609
Total assets	964,440	887,756
Current liabilities:
Accounts payable	14,157	7,860
Accrued expenses	36,061	33,272
Accrued income taxes	3,238	985
Deferred revenue and customer deposits	15,733	11,571
Total current liabilities	69,189	53,688
Deferred income taxes	326	319
Reserve for income taxes	5,651	4,830
Other non-current liabilities	2,630	3,252
Total liabilities	77,796	62,089
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 200,000 and 140,000 shares in 2016 and 2015, respectively, issued and outstanding: 85,109 and 84,856 shares in 2016 and 2015, respectively	170	170
Additional paid-in capital	330,969	311,008
Retained earnings	603,204	566,613
Accumulated other comprehensive loss, net of tax	(47,699)	(52,124)
Total shareholders’ equity	886,644	825,667
Total liabilities and shareholders' equity	$ 964,440	$ 887,756