CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 158,294		$ 93,430
Short-term Corporate bonds investments	487,812		484,345
Accounts receivable	92,677		92,664
Inventory	174,245		183,220
Other current assets	37,193		45,791
Total current assets	950,221		899,450
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $123,388 and $117,118	145,281		143,445
ACQUIRED TECHNOLOGY, net of accumulated amortization of $174,820 and $189,671	35,843	[1]	38,382
OTHER INTANGIBLE ASSETS, net of accumulated amortization of $9,341 and $8,989	7,947		8,247
GOODWILL	15,535		15,535
INVESTMENTS	213,369		259,861
DEFERRED INCOME TAXES	63,292		58,161
OTHER ASSETS	104,224		109,739
TOTAL ASSETS	1,535,712		1,532,820
CURRENT LIABILITIES:
Accounts payable	9,741		9,519
Accrued expenses	25,346		51,002
Deferred revenue	37,419		45,599
Other current liabilities	42,451		29,577
Total current liabilities	114,957		135,697
DEFERRED REVENUE	17,843		18,279
RETIREMENT PLAN BENEFIT LIABILITY	60,248		59,790
OTHER LIABILITIES	43,199		43,685
Total liabilities	236,247		257,451
COMMITMENTS AND CONTINGENCIES (Note 18)
SHAREHOLDERS' EQUITY:
Preferred Stock, par value $0.01 per share,5,000,000 shares authorized, 200,000 shares 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, 48,697,467 and 49,136,030 shares issued, and 47,331,819 and 47,770,382 shares outstanding, at March 31, 2023 and December 31, 2022, respectively	487		491
Additional paid-in capital	679,390		681,335
Retained earnings	676,347		653,277
Accumulated other comprehensive loss	(15,477)		(18,452)
Treasury stock, at cost (1,365,648 shares at March 31, 2023 and December 31, 2022)	(41,284)		(41,284)
Total shareholders’ equity	1,299,465		1,275,369
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,535,712		$ 1,532,820

[1] During the three months ended March 31, 2023, the gross value and accumulated amortization associated with the PD-LD, Inc. and Motorola patent portfolios have been removed from the table as the underlying patents have reached the end of their useful lives.