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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income $ 365,098 $ 206,535
Adjustments to reconcile net income from operations to net cash provided by operating activities:    
Depreciation 38,305 33,882
Amortization 26,234 24,976
Stock-based compensation 21,367 18,109
Contingent consideration adjustment 19,239 (8,701)
Provision for excess and obsolete inventory 9,637 5,799
Deferred taxes (7,163) 515
Gains on investments (469) (3,741)
Retirement plan actuarial (gains) losses (99) 448
Other 523 429
Changes in operating assets and liabilities, net of businesses acquired:    
Accounts receivable (331,040) (79,478)
Inventories (3,728) (2,447)
Prepayments and other assets (49,479) (17,067)
Accounts payable and other liabilities 113,578 (14,424)
Deferred revenue and customer advances 28,655 15,826
Retirement plans contributions (2,501) (2,414)
Income taxes 37,842 (14,973)
Net cash provided by operating activities 265,999 163,274
Cash flows from investing activities:    
Purchases of property, plant and equipment (84,014) (58,956)
Purchases of marketable securities (299,548) (484,181)
Proceeds from maturities of marketable securities 182,984 233,193
Proceeds from sales of marketable securities 26,661 42,454
Proceeds from life insurance 546 273
Acquisition of businesses, net of cash acquired 149 (21,970)
Net cash used for investing activities (173,222) (289,187)
Cash flows from financing activities:    
Issuance of common stock under stock purchase and stock option plans 12,757 15,089
Repurchase of common stock (88,465) (247,222)
Dividend payments (33,266) (31,019)
Payments related to net settlement of employee stock compensation awards (22,519) (14,446)
Payments of contingent consideration (8,852) (27,615)
Net cash used for financing activities (140,345) (305,213)
Effects of exchange rate changes on cash and cash equivalents (925) (519)
Decrease in cash and cash equivalents (48,493) (431,645)
Cash and cash equivalents at beginning of period 773,924 926,752
Cash and cash equivalents at end of period 725,431 495,107
Non-cash investing activities:    
Capital expenditures incurred but not yet paid $ 6,281 $ 4,068