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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Cash flows from operating activities:    
Net income $ 267,628 $ 237,379
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 18,971 17,794
Deferred income taxes (2,992) 5,208
Depreciation 30,585 30,796
Amortization of intangibles 25,251 21,609
In-process research and development   5,000
Change in operating assets and liabilities:    
Decrease in accounts receivable 36,591 41,945
Increase in inventories (33,877) (19,169)
Increase in other current assets (15,264) (9,253)
Decrease (increase) in other assets 159 (1,154)
Decrease in accounts payable and other current liabilities (68,414) (34,802)
Increase in deferred revenue and customer advances 40,134 53,601
(Decrease) increase in other liabilities (22,215) 2,306
Net cash provided by operating activities 276,557 351,260
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (36,831) (35,358)
Investment in unaffiliated company (3,215) (7,000)
Payments for intellectual property licenses   (5,000)
Purchases of investments (513,342) (1,554,769)
Maturities and sales of investments 1,759,770 1,308,275
Net cash provided by (used in) investing activities 1,206,382 (293,852)
Cash flows from financing activities:    
Proceeds from debt issuances 226 85,000
Payments on debt (850,000) (64)
Proceeds from stock plans 34,845 58,182
Purchases of treasury shares (553,144) (165,834)
(Payments for) proceeds from derivative contracts (2,158) 430
Net cash used in financing activities (1,370,231) (22,286)
Effect of exchange rate changes on cash and cash equivalents (12,823) 26,502
Increase in cash and cash equivalents 99,885 61,624
Cash and cash equivalents at beginning of period 642,319 505,631
Cash and cash equivalents at end of period $ 742,204 $ 567,255