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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 408,642 $ 373,483
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 28,184 30,068
Deferred income taxes 278 3,046
Depreciation 44,710 45,454
Amortization of intangibles 38,101 32,795
In-process research and development   5,000
Change in operating assets and liabilities:    
Decrease in accounts receivable 36,893 53,358
Increase in inventories (47,826) (26,217)
Increase in other current assets (21,091) (12,944)
Increase in other assets (235) (2,370)
Decrease in accounts payable and other current liabilities (84,203) (23,066)
Increase in deferred revenue and customer advances 23,085 29,332
Decrease in other liabilities (3,641) (2,483)
Net cash provided by operating activities 422,897 505,456
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (64,215) (55,257)
Asset acquisitions (31,486)  
Investment in unaffiliated companies (7,615) (7,000)
Payments for intellectual property licenses   (5,000)
Purchases of investments (908,147) (2,345,259)
Maturities and sales of investments 2,269,181 2,008,528
Net cash provided by (used in) investing activities 1,257,718 (403,988)
Cash flows from financing activities:    
Proceeds from debt issuances 10 130,190
Payments on debt (850,000) (64)
Proceeds from stock plans 42,377 72,821
Purchases of treasury shares (816,649) (245,742)
(Payments for) proceeds from derivative contracts (2,181) 3,301
Net cash used in financing activities (1,626,443) (39,494)
Effect of exchange rate changes on cash and cash equivalents (7,118) 36,202
Increase in cash and cash equivalents 47,054 98,176
Cash and cash equivalents at beginning of period 642,319 505,631
Cash and cash equivalents at end of period $ 689,373 $ 603,807