CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 814,019		$ 429,843
Marketable securities	418,410		1,347,979
Accounts receivable, less allowance for doubtful accounts of $2,214 and $2,219 at September 30, 2018 and December 31, 2017, respectively	352,476		272,783
Inventories, net	154,705		107,525
Prepayments and other current assets	139,785		112,151
Total current assets	1,879,395		2,270,281
Property, plant and equipment, net	278,071		268,447
Marketable securities	91,982		125,926
Deferred tax assets	70,772		84,026
Retirement plans assets	17,885		17,491
Other assets	11,421		12,275
Acquired intangible assets, net	139,963		79,088
Goodwill	392,998		252,011
Total assets	2,882,487	[1]	3,109,545
Current liabilities:
Accounts payable	107,890		86,393
Accrued employees' compensation and withholdings	116,546		141,694
Deferred revenue and customer advances	77,953		83,614
Other accrued liabilities	95,888		59,083
Contingent consideration	35,532		24,497
Income taxes payable	24,603		59,055
Total current liabilities	458,412		454,336
Retirement plans liabilities	127,037		119,776
Long-term deferred revenue and customer advances	29,387		30,127
Deferred tax liabilities	21,748		6,720
Long-term other accrued liabilities	28,956		10,273
Long-term contingent consideration	25,410		20,605
Long-term incomes taxes payable	147,360		148,075
Long-term debt	376,417		365,987
Total liabilities	1,214,727		1,155,899
Commitments and contingencies (See Note Q)
Shareholders' equity
Common stock, $0.125 par value, 1,000,000 shares authorized; 183,289 and 195,548 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	22,911		24,444
Additional paid-in capital	1,664,568		1,638,413
Accumulated other comprehensive income	3,524		18,776
(Accumulated deficit) Retained earnings	(23,243)		272,013
Total shareholders' equity	1,667,760		1,953,646
Total liabilities and shareholders' equity	$ 2,882,487		$ 3,109,545

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