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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 29, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 342,395 | $ 307,991
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 51,508 | 49,930
Amortization | 36,849 | 32,909
Stock-based compensation | 28,822 | 25,327
Deferred taxes | (2,977) | 24,442
Provision for excess and obsolete inventory | 8,848 | 9,522
Contingent consideration fair value adjustment | (16,460) | (9,236)
Gains on marketable securities | (4,158) | (420)
Retirement plans actuarial losses | 448 | 196
Other | 610 | 936
Changes in operating assets and liabilities, net of businesses acquired: |  |
Accounts receivable | (66,789) | (77,807)
Inventories | (14,143) | (34,117)
Prepayments and other assets | (16,118) | (28,719)
Accounts payable and other liabilities | 20,807 | 16,124
Deferred revenue and customer advances | 27,779 | 9,823
Retirement plans contributions | (3,775) | (3,244)
Income taxes | (31,224) | (33,152)
Net cash provided by operating activities | 362,422 | 290,505
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (96,048) | (88,269)
Proceeds from government subsidy for property, plant and equipment |  | 7,920
Purchases of marketable securities | (605,539) | (809,521)
Proceeds from sales of marketable securities | 60,274 | 843,164
Proceeds from maturities of marketable securities | 393,472 | 934,100
Proceeds from life insurance | 2,912 | 1,126
Purchase of investment and acquisition of businesses, net of cash acquired | (21,970) | (169,474)
Net cash (used for) provided by investing activities | (266,899) | 719,046
Cash flows from financing activities: |  |
Issuance of common stock under stock purchase and stock option plans | 29,280 | 20,959
Repurchase of common stock | (368,782) | (562,263)
Dividend payments | (46,269) | (51,320)
Payments related to net settlement of employee stock compensation awards | (14,550) | (19,841)
Payments of contingent consideration | (27,615) | (13,571)
Net cash used for financing activities | (427,936) | (626,036)
Effects of exchange rate changes on cash and cash equivalents | (400) | 661
(Decrease) increase in cash and cash equivalents | (332,813) | 384,176
Cash and cash equivalents at beginning of period | 926,752 | 429,843
Cash and cash equivalents at end of period | $ 593,939 | $ 814,019

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