Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 298,356	$ 171,431
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019	95,365	240,470
Accounts receivable, less reserves of $913 and $1,821 in 2020 and 2019, respectively	127,755	103,447
Unbilled revenue	15,389	4,782
Inventories	53,860	60,261
Prepaid expenses and other current assets	37,411	26,840
Total current assets	628,136	607,231
Non-current investments, amortized cost of $613,838 and $431,633 in 2020 and 2019, respectively, allowance for expected credit losses of $75 and $0 in 2020 and 2019, respectively	619,343	433,452
Property, plant, and equipment, net	81,225	89,443
Operating lease assets	24,942	17,522
Goodwill	243,129	243,445
Intangible assets, net	16,482	39,490
Deferred income taxes	439,574	449,519
Other assets	7,684	5,833
Total assets	2,060,515	1,885,935
Current liabilities:
Accounts payable	21,464	17,866
Accrued expenses	68,348	52,199
Accrued income taxes	8,006	30,333
Deferred revenue and customer deposits	33,717	14,432
Operating lease liabilities	7,863	5,647
Total current liabilities	139,398	120,477
Operating Lease, Liability, Noncurrent	20,053	12,326
Deferred income taxes	326,703	332,344
Reserve for income taxes	11,325	11,563
Non-current accrued income taxes	48,915	51,113
Other liabilities	8,292	2,402
Total liabilities	554,686	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: 174,633 and 172,440 shares in 2020 and 2019, respectively	349	345
Additional paid-in capital	762,832	639,372
Retained earnings	780,521	753,268
Accumulated other comprehensive loss, net of tax	(37,873)	(37,275)
Total shareholders’ equity	1,505,829	1,355,710
Total liabilities and shareholders' equity	$ 2,060,515	$ 1,885,935