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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 25, 2021 | Sep. 26, 2020
Cash flows from operating activities: |  |
Net income | $ 95,612 | $ 11,111
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities: |  |
Amortization of intangibles | 37,674 | 41,081
Depreciation | 11,044 | 9,834
Share-based compensation | 15,107 | 12,983
Acquired inventory step-up amortization | 253 | 10,172
Provision for inventory valuation | 6,262 | 5,437
Other, net | 893 | 546
Changes in operating assets and liabilities, net of effects of business acquired | (40,565) | (18,305)
Net cash and cash equivalents provided by operating activities | 126,280 | 72,859
Cash flows from investing activities: |  |
Purchases of marketable securities | (250,486) | (250,928)
Proceeds from sales of marketable securities | 177,529 | 201,764
Cash received from convertible note receivable |  | 2,848
Purchase of business, net of cash acquired | (26,795) |
Purchases of property, plant and equipment | (11,176) | (3,391)
Net cash and cash equivalents used in investing activities | (110,928) | (49,707)
Cash flows from financing activities: |  |
Purchase of common stock |  | (52,000)
Tax payments related to shares withheld for share-based compensation plans | (6,780) | (3,546)
Payment of contingent consideration for acquired business |  | (435)
Issuance of shares through share-based compensation plans | 6,409 | 2,845
Net cash and cash equivalents used in financing activities | (371) | (53,136)
Effect of exchange rate changes on cash and cash equivalents | 506 | 917
Net increase (decrease) in cash and cash equivalents | 15,487 | (29,067)
Cash and cash equivalents at beginning of period | 136,720 | 130,673
Cash and cash equivalents at end of period | 152,207 | 101,606
Supplemental disclosure of cash flow information: |  |
Income taxes paid (net of refunds) | $ 16,524 | $ 4,562

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