CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 186,161,000	$ 269,073,000
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020	137,455,000	103,240,000
Accounts receivable, allowance for credit losses of $776 and $831 in 2021 and 2020, respectively	130,348,000	125,696,000
Unbilled revenue	3,990,000	5,632,000
Inventories	113,102,000	60,830,000
Prepaid expenses and other current assets	68,742,000	37,220,000
Total current assets	639,798,000	601,691,000
Non-current investments, amortized cost of $587,981 and $390,417 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020	583,748,000	395,125,000
Property, plant, and equipment, net	77,546,000	79,173,000
Operating lease assets	23,157,000	22,582,000
Goodwill	241,713,000	244,078,000
Intangible Assets, Net (Excluding Goodwill)	11,888,000	15,555,000
Deferred income taxes	418,570,000	434,704,000
Other assets	7,242,000	7,794,000
Total assets	2,003,662,000	1,800,702,000
Current liabilities:
Accounts payable	44,051,000	16,270,000
Accrued expenses	92,432,000	77,264,000
Accrued income taxes	8,577,000	9,379,000
Deferred revenue and customer deposits	35,743,000	21,274,000
Operating lease liabilities	7,786,000	8,110,000
Total current liabilities	188,589,000	132,297,000
Non-current operating lease liabilities	17,795,000	18,120,000
Deferred income taxes	293,769,000	314,952,000
Reserve for income taxes	14,780,000	14,257,000
Non-current accrued income taxes	43,160,000	48,915,000
Other liabilities	15,476,000	9,959,000
Total liabilities	573,569,000	538,500,000
Commitments and contingencies (Note 11)
Shareholders’ equity:
Preferred stock, $.01 par value - Authorized: 400 shares in 2021 and 2020, respectively, no shares issued and outstanding	0	0
Common stock, $.002 par value – Authorized: 300,000 shares in 2021 and 2020, respectively, issued and outstanding: 175,481 and 175,790 shares in 2021 and 2020, respectively	351,000	352,000
Additional paid-in capital	914,802,000	807,739,000
Retained earnings	562,882,000	487,912,000
Accumulated other comprehensive loss, net of tax	(47,942,000)	(33,801,000)
Total shareholders’ equity	1,430,093,000	1,262,202,000
Total liabilities and shareholders' equity	$ 2,003,662,000	$ 1,800,702,000