CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 01, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 480,384		$ 429,843
Marketable securities	712,309		1,347,979
Accounts receivable, less allowance for doubtful accounts of $2,216 and $2,219 at July 1, 2018 and December 31, 2017, respectively	454,122		272,783
Inventories, net	135,550		107,525
Prepayments and other current assets	111,820		112,151
Total current assets	1,894,185		2,270,281
Property, plant and equipment, net	285,302		268,447
Marketable securities	111,417		125,926
Deferred tax assets	73,574		84,026
Retirement plans assets	18,252		17,491
Other assets	12,192		12,275
Acquired intangible assets, net	148,173		79,088
Goodwill	388,625		252,011
Total assets	2,931,720	[1]	3,109,545
Current liabilities:
Accounts payable	102,737		86,393
Accrued employees' compensation and withholdings	115,264		141,694
Deferred revenue and customer advances	82,491		83,614
Other accrued liabilities	83,681		59,083
Contingent consideration	35,911		24,497
Income taxes payable	32,226		59,055
Total current liabilities	452,310		454,336
Retirement plans liabilities	124,258		119,776
Long-term deferred revenue and customer advances	25,375		30,127
Deferred tax liabilities	22,281		6,720
Long-term other accrued liabilities	22,296		10,273
Long-term contingent consideration	25,003		20,605
Long-term incomes taxes payable	147,360		148,075
Long-term debt	372,897		365,987
Total liabilities	1,191,780		1,155,899
Commitments and contingencies (See Note Q)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 187,962 and 195,548 shares issued and outstanding at July 1, 2018 and December 31, 2017, respectively	23,495		24,444
Additional paid-in capital	1,645,679		1,638,413
Accumulated other comprehensive (loss) income	(3,504)		18,776
Retained earnings	74,270		272,013
Total shareholders' equity	1,739,940		1,953,646
Total liabilities and shareholders' equity	$ 2,931,720		$ 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.