CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 171,431,000	$ 108,212,000
Current investments	240,470,000	427,348,000
Accounts receivable, less reserves of $1,821 and $1,646 in 2019 and 2018, respectively	103,447,000	119,172,000
Unbilled revenue	4,782,000	8,312,000
Inventories	60,261,000	83,282,000
Prepaid expenses and other current assets	26,840,000	34,000,000
Total current assets	607,231,000	780,326,000
Non-current investments	433,452,000	262,039,000
Property, plant, and equipment, net	89,443,000	91,396,000
Operating lease assets	17,522,000	0
Goodwill	243,445,000	113,208,000
Intangible Assets, Net (Excluding Goodwill)	39,490,000	10,113,000
Deferred income taxes	449,519,000	28,660,000
Other assets	5,833,000	3,925,000
Total assets	1,885,935,000	1,289,667,000
Current liabilities:
Accounts payable	17,866,000	16,230,000
Accrued expenses	52,199,000	60,220,000
Accrued income taxes	30,333,000	5,062,000
Deferred revenue and customer deposits	14,432,000	9,845,000
Operating lease liabilities	5,647,000	0
Total current liabilities	120,477,000	91,357,000
Non-current operating lease liabilities	12,326,000	0
Deferred income taxes	332,344,000	962,000
Reserve for income taxes	11,563,000	7,106,000
Non-current accrued income taxes	51,113,000	51,113,000
Other liabilities	2,402,000	3,866,000
Total liabilities	530,225,000	154,404,000
Commitments and contingencies (Note 11)
Shareholders’ equity:
Preferred stock,$.01 par value - Authorized: 400 shares in 2019 and 2018, respectively, no shares issued and outstanding	0	0
Common stock, $.002 par value – Authorized: 300,000 shares in 2019 and 2018, respectively, issued and outstanding: 172,440 and 170,820 shares in 2019 and 2018, respectively	345,000	342,000
Additional paid-in capital	639,372,000	529,208,000
Retained earnings	753,268,000	646,214,000
Accumulated other comprehensive loss, net of tax	(37,275,000)	(40,501,000)
Total shareholders’ equity	1,355,710,000	1,135,263,000
Total liabilities and shareholders' equity	$ 1,885,935,000	$ 1,289,667,000