Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 29, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 121,701	$ 108,212
Current investments	292,072	427,348
Accounts receivable, less reserves of $1,874 and $1,646 in 2019 and 2018, respectively	107,407	119,172
Unbilled revenue	11,210	8,312
Inventories	65,264	83,282
Prepaid expenses and other current assets	28,127	34,000
Total current assets	625,781	780,326
Non-current investments	504,641	262,039
Property, plant, and equipment, net	88,429	91,396
Operating Lease, Right-of-Use Asset	15,806	0
Goodwill	113,208	113,208
Intangible assets, net	7,994	10,113
Deferred income taxes	29,273	28,660
Other assets	5,320	3,925
Total assets	1,390,452	1,289,667
Current liabilities:
Accounts payable	12,766	16,230
Accrued expenses	48,561	60,220
Accrued income taxes	4,012	5,062
Deferred revenue and customer deposits	10,431	9,845
Operating Lease, Liability, Current	5,445	0
Total current liabilities	81,215	91,357
Operating Lease, Liability, Noncurrent	10,722	0
Deferred income taxes	289	962
Reserve for income taxes	7,151	7,106
Non-current accrued income taxes	51,113	51,113
Other liabilities	744	3,866
Total liabilities	151,234	154,404
Preferred Stock, Value, Outstanding	0	0
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 300,000 shares in 2019 and 2018, respectively, issued and outstanding: 170,897 and 170,820 shares in 2019 and 2018, respectively	342	342
Additional paid-in capital	594,427	529,208
Retained earnings	682,383	646,214
Accumulated other comprehensive loss, net of tax	(37,934)	(40,501)
Total shareholders’ equity	1,239,218	1,135,263
Total liabilities and shareholders' equity	$ 1,390,452	$ 1,289,667