Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 544,128	$ 465,232
Short-term investments	3,479	3,057
Receivables, net	180,571	157,171
Inventories	30,734	39,475
Prepaid expenses and other	41,092	37,099
Total current assets	800,004	702,034
Property, plant and equipment, net of accumulated depreciation of $623,185 and $612,961, respectively	243,949	238,607
Goodwill	574,545	572,764
Acquired intangibles, net of accumulated amortization of $254,949 and $267,723, respectively	244,445	258,814
Long-term receivables	13,127	12,949
Other assets	315,128	311,740
Total assets	2,191,198	2,096,908
Current Liabilities:
Revolving credit facility	50,000	50,000
Accounts payable and accrued liabilities	193,978	239,496
Current portion of deferred revenue	331,848	296,066
Total current liabilities	575,826	585,562
Long-Term Liabilities:
Long-term portion of deferred revenue	66,399	66,769
Long-term debt	643,709	643,493
Other long-term liabilities	64,672	59,314
Total long-term liabilities	774,780	769,576
Commitments and contingencies
Stockholders' Equity:
Common stock and capital in excess of par value	1,824,306	1,820,081
Treasury stock, at cost	(1,166,599)	(1,190,053)
Retained earnings	205,161	136,902
Accumulated other comprehensive loss	(22,276)	(25,160)
Total stockholders’ equity	840,592	741,770
Total liabilities and stockholders’ equity	$ 2,191,198	$ 2,096,908