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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 429,843 $ 307,884
Marketable securities 1,347,979 871,024
Accounts receivable, less allowance for doubtful accounts of $2,219 and $2,356 in 2017 and 2016, respectively 272,783 192,444
Inventories, net 107,525 135,958
Prepayments and other current assets 112,151 116,493
Total current assets 2,270,281 1,623,803
Property, plant and equipment, net 268,447 253,821
Marketable securities 125,926 433,843
Deferred tax assets 84,026 107,405
Retirement plans assets 17,491 7,712
Other assets 12,275 12,165
Acquired intangible assets, net 79,088 100,401
Goodwill 252,011 223,343
Total assets [1] 3,109,545 2,762,493
Current liabilities:    
Accounts payable 86,393 95,362
Accrued employees' compensation and withholdings 141,694 109,944
Deferred revenue and customer advances 83,614 84,478
Other accrued liabilities 59,083 51,382
Contingent consideration 24,497 1,050
Income taxes payable 59,055 30,480
Total current liabilities 454,336 372,696
Retirement plans liabilities 119,776 106,938
Long-term deferred revenue and customer advances 30,127 23,463
Long-term contingent consideration 20,605 37,282
Deferred tax liabilities 6,720 12,144
Long-term other accrued liabilities 10,273 28,642
Long-term income taxes payable 148,075  
Long-term debt 365,987 352,669
Total liabilities 1,155,899 933,834
Commitments and contingencies (Note K)
SHAREHOLDERS' EQUITY    
Common stock, $0.125 par value, 1,000,000 shares authorized, 195,548 and 199,177 shares issued and outstanding at December 31, 2017 and 2016, respectively 24,444 24,897
Additional paid-in capital 1,638,413 1,593,684
Accumulated other comprehensive income (loss) 18,776 (20,214)
Retained earnings 272,013 230,292
Total shareholders' equity 1,953,646 1,828,659
Total liabilities and shareholders' equity $ 3,109,545 $ 2,762,493
[1] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.