CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 93,430	$ 311,993
Short-term investments	484,345	351,194
Accounts receivable	92,664	107,639
Inventory	183,220	134,160
Other current assets	45,791	20,948
Total current assets	899,450	925,934
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $117,118 and $92,461	143,445	128,832
ACQUIRED TECHNOLOGY, net of accumulated amortization of $189,671 and $173,635	38,382	49,668
OTHER INTANGIBLE ASSETS, net of accumulated amortization of $8,989 and $7,565	8,247	9,711
GOODWILL	15,535	15,535
INVESTMENTS	259,861	168,076
DEFERRED INCOME TAXES	58,161	33,453
OTHER ASSETS	109,739	135,710
TOTAL ASSETS	1,532,820	1,466,919
CURRENT LIABILITIES:
Accounts payable	9,519	14,955
Accrued expenses	51,002	45,474
Deferred revenue	45,599	120,864
Other current liabilities	29,577	6,645
Total current liabilities	135,697	187,938
DEFERRED REVENUE	18,279	36,217
RETIREMENT PLAN BENEFIT LIABILITY	59,790	66,773
OTHER LIABILITIES	43,685	76,077
Total liabilities	257,451	367,005
COMMITMENTS AND CONTINGENCIES (Note 18)
SHAREHOLDERS' EQUITY:
Preferred Stock, par value $0.01 per share, 5,000,000 shares authorized, 200,000shares of Series A Nonconvertible Preferred Stock issued and outstanding (liquidation value of $7.50 per share or $1,500)	2	2
Common Stock, par value $0.01 per share, 200,000,000 shares authorized, 49,136,030 and 49,065,924 shares issued, and 47,770,382 and 47,700,276 shares outstanding at December 31, 2022 and December 31, 2021, respectively	491	491
Additional paid-in capital	681,335	658,728
Retained earnings	653,277	500,212
Accumulated other comprehensive loss	(18,452)	(18,235)
Treasury stock, at cost (1,365,648 shares at December 31, 2022 and December 31, 2021)	(41,284)	(41,284)
Total shareholders’ equity	1,275,369	1,099,914
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,532,820	$ 1,466,919