CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 1,122,199	$ 914,121
Marketable securities		244,231	522,280
Accounts receivable, less allowance for credit losses of $2,012 and $2,034 in 2021 and 2020, respectively		550,749	497,506
Inventories, net		243,330	222,189
Prepayments		406,266	250,092
Other current assets		9,452	9,246
Total current assets		2,576,227	2,415,434
Property, plant and equipment, net		387,240	394,800
Operating lease right-of-use assets, net		68,807	54,569
Marketable securities		133,858	117,980
Deferred tax assets		102,428	87,913
Retirement plans assets		15,110	17,468
Other assets		24,096	9,384
Acquired intangible assets, net		75,635	100,939
Goodwill		426,024	453,859
Total assets	[1]	3,809,425	3,652,346
Current liabilities:
Accounts payable		153,133	133,663
Accrued employees' compensation and withholdings		253,667	220,321
Deferred revenue and customer advances		146,185	134,662
Other accrued liabilities		124,187	77,581
Operating lease liabilities		19,977	20,573
Income taxes payable		88,789	80,728
Current debt		19,182	33,343
Total current liabilities		805,120	700,871
Retirement plans liabilities		151,141	151,140
Long-term deferred revenue and customer advances		54,921	58,359
Long-term contingent consideration		0	7,227
Deferred tax liabilities		6,327	10,821
Long-term other accrued liabilities		15,497	19,352
Long-term operating lease liabilities		56,178	42,073
Long-term incomes taxes payable		67,041	74,930
Debt		89,244	376,768
Total liabilities		1,245,469	1,441,541
Commitments and contingencies
Mezzanine equity:
Convertible common shares		1,512	3,787
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 162,251 and 166,123 shares issued and outstanding at December 31, 2021 and 2020, respectively		20,281	20,765
Additional paid-in capital		1,811,545	1,765,323
Accumulated other comprehensive income (loss)		(5,948)	33,516
Retained earnings (accumulated deficit)		736,566	387,414
Total shareholders' equity		2,562,444	2,207,018
Total liabilities, convertible common shares and shareholders' equity		$ 3,809,425	$ 3,652,346

[1] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.