CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 181,374,000	$ 186,161,000
Current investments, amortized cost of $223,545 and $137,124 in 2022 and 2021, respectively, allowance for credit losses of $0 in 2022 and 2021	218,759,000	137,455,000
Accounts receivable, allowance for credit losses of $730 and $776 in 2022 and 2021, respectively	125,417,000	130,348,000
Unbilled revenue	2,179,000	3,990,000
Inventories	122,480,000	113,102,000
Prepaid expenses and other current assets	67,490,000	68,742,000
Total current assets	717,699,000	639,798,000
Non-current investments, amortized cost of $476,148 and $587,981 in 2022 and 2021, respectively, allowance for credit losses of $0 in 2022 and 2021	454,117,000	583,748,000
Property, plant, and equipment, net	79,714,000	77,546,000
Operating lease assets	37,682,000	23,157,000
Goodwill	242,630,000	241,713,000
Intangible assets, net	12,414,000	11,888,000
Deferred income taxes	407,241,000	418,570,000
Other assets	6,643,000	7,242,000
Total assets	1,958,140,000	2,003,662,000
Current liabilities:
Accounts payable	27,103,000	44,051,000
Accrued expenses	93,235,000	92,432,000
Accrued income taxes	18,129,000	8,577,000
Deferred revenue and customer deposits	40,787,000	35,743,000
Operating lease liabilities	8,454,000	7,786,000
Total current liabilities	187,708,000	188,589,000
Non-current operating lease liabilities	31,298,000	17,795,000
Deferred income taxes	249,961,000	293,769,000
Reserve for income taxes	15,866,000	14,780,000
Non-current accrued income taxes	33,008,000	43,160,000
Other liabilities	1,905,000	15,476,000
Total liabilities	519,746,000	573,569,000
Commitments and contingencies (Note 11)
Authorized shares (in shares)	400,000	400,000
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Shareholders’ equity:
Preferred stock, $0.01 par value - Authorized: 400 shares in 2022 and 2021, respectively, no shares issued and outstanding	$ 0	$ 0
Common stock, $0.002 par value – Authorized: 300,000 shares in 2022 and 2021, respectively, issued and outstanding: 172,631 and 175,481 shares in 2022 and 2021, respectively	345,000	351,000
Additional paid-in capital	979,167,000	914,802,000
Retained earnings	528,179,000	562,882,000
Accumulated other comprehensive loss, net of tax	(69,297,000)	(47,942,000)
Total shareholders’ equity	1,438,394,000	1,430,093,000
Total liabilities and shareholders' equity	$ 1,958,140,000	$ 2,003,662,000