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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Cash flows from operating activities:    
Net income $ 373,483 $ 347,125
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 30,068 32,604
Deferred income taxes 3,046 4,924
Depreciation 45,454 38,854
Amortization of intangibles 32,795 33,510
Excess tax benefit related to stock-based compensation plans   12,914
Gain on sale of assets   (1,500)
In-process research and development charge 5,000  
Change in operating assets and liabilities, net of acquisitions:    
Decrease in accounts receivable 53,358 39,471
Increase in inventories (26,217) (39,988)
Increase in other current assets (12,944) (2,906)
Increase in other assets (2,370) (4,667)
Decrease in accounts payable and other current liabilities (23,066) (29,179)
Increase in deferred revenue and customer advances 29,332 29,244
(Decrease) increase in other liabilities (2,483) 8,611
Net cash provided by operating activities 505,456 469,017
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (55,257) (72,296)
Business acquisitions, net of cash acquired   (5,654)
Investment in unaffiliated company (7,000)  
Payments for intellectual property licenses (5,000)  
Purchases of investments (2,345,259) (1,923,054)
Maturities and sales of investments 2,008,528 1,558,330
Proceeds from sale of assets   4,000
Net cash used in investing activities (403,988) (438,674)
Cash flows from financing activities:    
Proceeds from debt issuances 130,190 440,177
Payments on debt (64) (325,323)
Payments of debt issuance costs   (1,705)
Proceeds from stock plans 72,821 58,572
Purchases of treasury shares (245,742) (241,924)
Proceeds from (payments for) derivative contracts 3,301 (9,525)
Net cash used in financing activities (39,494) (79,728)
Effect of exchange rate changes on cash and cash equivalents 36,202 (8,071)
Increase (decrease) in cash and cash equivalents 98,176 (57,456)
Cash and cash equivalents at beginning of period 505,631 487,665
Cash and cash equivalents at end of period $ 603,807 $ 430,209