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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Cash flows from operating activities:    
Net income $ 587,815 $ 342,395
Adjustments to reconcile net income from operations to net cash provided by operating activities:    
Depreciation 58,111 51,508
Amortization 36,577 36,849
Stock-based compensation 33,028 28,822
Provision for excess and obsolete inventory (7,967) (16,460)
Contingent consideration adjustment 13,116 8,848
Deferred taxes (4,547) (2,977)
Gains on investments (3,515) (4,158)
Retirement plan actuarial losses 2,589 448
Other 750 610
Changes in operating assets and liabilities, net of businesses acquired:    
Accounts receivable (222,015) (66,789)
Inventories 16,998 (14,143)
Prepayments and other assets (40,751) (16,118)
Accounts payable and other liabilities 81,557 20,807
Deferred revenue and customer advances 36,589 27,779
Retirement plans contributions (3,884) (3,775)
Income taxes 24,060 (31,224)
Net cash provided by operating activities 608,511 362,422
Cash flows from investing activities:    
Purchases of property, plant and equipment (146,872) (96,048)
Purchases of marketable securities (488,428) (605,539)
Proceeds from maturities of marketable securities 309,407 393,472
Proceeds from sales of marketable securities 32,611 60,274
Proceeds from life insurance 546 2,912
Acquisition of businesses, net of cash acquired 149 (21,970)
Net cash used for investing activities (292,587) (266,899)
Cash flows from financing activities:    
Issuance of common stock under stock purchase and stock option plans 26,528 29,280
Repurchase of common stock (88,465) (368,782)
Dividend payments (49,870) (46,269)
Payments related to net settlement of employee stock compensation awards (22,735) (14,550)
Payments of contingent consideration (8,852) (27,615)
Net cash used for financing activities (143,394) (427,936)
Effects of exchange rate changes on cash and cash equivalents (1,274) (400)
Increase (decrease) in cash and cash equivalents 171,256 (332,813)
Cash and cash equivalents at beginning of period 773,924 926,752
Cash and cash equivalents at end of period 945,180 593,939
Non-cash investing activities:    
Capital expenditures incurred but not yet paid $ 3,119 $ 2,922