CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 02, 2017		Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 598,349		$ 307,884
Marketable securities	809,338		871,024
Accounts receivable, less allowance for doubtful accounts of $2,236 and $2,356 at July 2, 2017 and December 31, 2016, respectively	405,946		192,444
Inventories, net	153,645		135,958
Prepayments	105,960		108,454
Other current assets	6,787		8,039
Total current assets	2,080,025		1,623,803
Property, plant and equipment, net	258,017		253,821
Marketable securities	212,501		433,843
Deferred tax assets	125,204		107,405
Other assets	12,429		12,165
Retirement plan assets	9,231		7,712
Acquired intangible assets, net	90,603		100,401
Goodwill	242,215		223,343
Total assets	3,030,225	[1]	2,762,493
Current liabilities:
Accounts payable	103,454		95,362
Accrued employees' compensation and withholdings	122,246		109,944
Deferred revenue and customer advances	81,087		84,478
Other accrued liabilities	66,176		51,382
Contingent consideration	22,432		1,050
Accrued income taxes	43,812		30,480
Total current liabilities	439,207		372,696
Retirement plan liabilities	111,688		106,938
Long-term deferred revenue and customer advances	32,679		23,463
Deferred tax liabilities	10,714		12,144
Long-term other accrued liabilities	11,061		28,642
Long-term contingent consideration	16,983		37,282
Long-term debt	359,245		352,669
Total liabilities	981,577		933,834
Commitments and contingencies (Note P)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 197,999 and 199,177 shares issued and outstanding at July 2, 2017 and December 31, 2016, respectively	24,750		24,897
Additional paid-in capital	1,613,005		1,593,684
Accumulated other comprehensive income (loss)	5,915		(20,214)
Retained earnings	404,978		230,292
Total shareholders' equity	2,048,648		1,828,659
Total liabilities and shareholders' equity	$ 3,030,225		$ 2,762,493

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