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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Cash flows from operating activities:    
Net income $ 206,535 $ 188,010
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 33,882 33,156
Amortization 24,976 20,177
Stock-based compensation 18,109 17,625
Deferred taxes 515 17,312
Provision for excess and obsolete inventory 5,799 6,175
Contingent consideration fair value adjustment (8,701) (8,468)
(Gains) losses on marketable securities (3,741) 762
Retirement plan actuarial losses (gains) 448 (71)
Other 429 406
Changes in operating assets and liabilities, net of businesses acquired:    
Accounts receivable (79,478) (179,403)
Inventories (2,447) (21,283)
Prepayments and other assets (17,067) 1,641
Accounts payable and other liabilities (14,424) (8,155)
Deferred revenue and customer advances 15,826 10,518
Retirement plans contributions (2,414) (2,173)
Income taxes (14,973) (26,308)
Net cash provided by operating activities 163,274 49,921
Cash flows from investing activities:    
Purchases of property, plant and equipment (58,956) (62,663)
Purchases of marketable securities (484,181) (647,071)
Proceeds from sales of marketable securities 42,454 829,053
Proceeds from maturities of marketable securities 233,193 469,862
Proceeds from life insurance 273  
Purchase of investments and acquisition of businesses, net of cash acquired (21,970) (170,632)
Net cash (used for) provided by investing activities (289,187) 418,549
Cash flows from financing activities:    
Issuance of common stock under stock purchase and stock option plans 15,089 10,681
Repurchase of common stock (247,222) (360,795)
Dividend payments (31,019) (34,682)
Payments related to net settlement of employee stock compensation awards (14,446) (19,751)
Payments of contingent consideration (27,615) (13,571)
Net cash used for financing activities (305,213) (418,118)
Effects of exchange rate changes on cash and cash equivalents (519) 189
(Decrease) increase in cash and cash equivalents (431,645) 50,541
Cash and cash equivalents at beginning of period 926,752 429,843
Cash and cash equivalents at end of period $ 495,107 $ 480,384