CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 773,924	$ 926,752
Marketable securities		137,303	190,096
Accounts receivable, less allowance for doubtful accounts of $1,736 and $1,673 in 2019 and 2018, respectively		362,368	291,267
Inventories, net		196,691	153,541
Prepayments and other current assets		188,598	170,826
Total current assets		1,658,884	1,732,482
Property, plant and equipment, net		320,216	279,821
Lease right-of-use assets		57,539
Marketable securities		104,490	87,731
Deferred tax assets		75,185	70,848
Retirement plans assets		18,457	16,883
Other assets		10,332	11,509
Acquired intangible assets, net		125,480	125,482
Goodwill		416,431	381,850
Total assets	[1]	2,787,014	2,706,606
Current liabilities:
Accounts payable		126,617	100,688
Accrued employees' compensation and withholdings		163,883	148,566
Deferred revenue and customer advances		104,876	77,711
Other accrued liabilities		70,871	78,272
Operating lease liabilities		19,476
Contingent consideration		9,106	34,865
Income taxes payable		44,200	36,185
Total current liabilities		539,029	476,287
Retirement plans liabilities		134,471	117,456
Long-term deferred revenue and customer advances		45,974	32,750
Long-term contingent consideration		30,599	35,678
Deferred tax liabilities		14,070	20,662
Long-term other accrued liabilities		19,535	37,547
Long-term operating lease liabilities		45,849
Long-term income taxes payable		82,642	83,891
Debt		394,687	379,981
Total liabilities		1,306,856	1,184,252
Commitments and contingencies (Note M)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 166,410 and 175,522 shares issued and outstanding at December 31, 2019 and 2018, respectively		20,801	21,940
Additional paid-in capital		1,720,129	1,671,645
Accumulated other comprehensive loss		(18,854)	(13,040)
Accumulated deficit		(241,918)	(158,191)
Total shareholders' equity		1,480,158	1,522,354
Total liabilities and shareholders' equity		$ 2,787,014	$ 2,706,606

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