Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 29, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 239,197	$ 171,431
Current investments	159,244	240,470
Accounts receivable, less reserves of $2,061 and $1,821 in 2020 and 2019, respectively	100,463	103,447
Unbilled revenue	5,485	4,782
Inventories	54,985	60,261
Prepaid expenses and other current assets	35,913	26,840
Total current assets	595,287	607,231
Non-current investments	446,955	433,452
Property, plant, and equipment, net	86,702	89,443
Operating lease assets	17,346	17,522
Goodwill	242,214	243,445
Intangible assets, net	38,102	39,490
Deferred income taxes	450,280	449,519
Other assets	8,191	5,833
Total assets	1,885,077	1,885,935
Current liabilities:
Accounts payable	16,195	17,866
Accrued expenses	63,955	52,199
Accrued income taxes	38,692	30,333
Deferred revenue and customer deposits	26,252	14,432
Operating lease liabilities	5,550	5,647
Total current liabilities	150,644	120,477
Operating Lease, Liability, Noncurrent	12,416	12,326
Deferred income taxes	330,532	332,344
Reserve for income taxes	11,891	11,563
Non-current accrued income taxes	48,915	51,113
Other liabilities	3,186	2,402
Total liabilities	557,584	530,225
Preferred Stock, Value, Outstanding	0	0
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 300,000 shares in 2020 and 2019, respectively, issued and outstanding: 171,688 and 172,440 shares in 2020 and 2019, respectively	344	345
Additional paid-in capital	664,132	639,372
Retained earnings	713,208	753,268
Accumulated other comprehensive loss, net of tax	(50,191)	(37,275)
Total shareholders’ equity	1,327,493	1,355,710
Total liabilities and shareholders' equity	$ 1,885,077	$ 1,885,935