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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 108,986 $ 111,951
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 9,941 9,892
Deferred income taxes 1,442 1,071
Depreciation 12,006 16,083
Amortization of intangibles 12,758 12,557
Change in operating assets and liabilities:    
Decrease in accounts receivable 59,331 40,588
Increase in inventories (44,438) (28,101)
Increase in other current assets (3,547) (13,049)
Decrease (increase) in other assets 4,637 (4,409)
Decrease in accounts payable and other current liabilities (33,485) (34,258)
Increase in deferred revenue and customer advances 57,539 45,096
Effect of the 2017 Tax & Jobs Act (3,229) 12,450
(Decrease) increase in other liabilities (6,162) 5,970
Net cash provided by operating activities 175,779 175,841
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (25,666) (15,992)
Investment in unaffiliated companies   (3,215)
Purchases of investments (26,732) (170,041)
Maturities and sales of investments 486,437 1,085,087
Net cash provided by investing activities 434,039 895,839
Cash flows from financing activities:    
Proceeds from debt issuances 166 81
Payments on debt (80) (750,000)
Proceeds from stock plans 27,631 24,287
Purchases of treasury shares (753,105) (282,370)
Proceeds from derivative contracts 2,254 1,937
Net cash used in financing activities (723,134) (1,006,065)
Effect of exchange rate changes on cash and cash equivalents 2,006 8,588
(Decrease) increase in cash and cash equivalents (111,310) 74,203
Cash and cash equivalents at beginning of period 796,280 642,319
Cash and cash equivalents at end of period $ 684,970 $ 716,522