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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 27, 2021 | Mar. 28, 2020
Cash flows from operating activities: |  |
Net income (loss) | $ 24,113 | $ (4,404)
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities: |  |
Amortization of intangibles | 12,357 | 13,732
Depreciation | 3,618 | 3,103
Share-based compensation | 4,890 | 3,955
Acquired inventory step-up amortization | 252 | 9,898
Provision for inventory valuation | 2,267 | 928
Other, net | 2,173 | (144)
Changes in operating assets and liabilities, net of effects of business acquired | 1,329 | (18,170)
Net cash and cash equivalents provided by operating activities | 50,999 | 8,898
Cash flows from investing activities: |  |
Purchases of marketable securities | (83,652) | (76,460)
Proceeds from sales of marketable securities | 53,973 | 74,857
Purchase of business, net of cash acquired | (26,795) |
Purchases of property, plant and equipment | (3,875) | (997)
Net cash and cash equivalents used in investing activities | (60,349) | (2,600)
Cash flows from financing activities: |  |
Purchase of common stock |  | (33,614)
Tax payments related to shares withheld for share-based compensation plans | (2,492) | (1,565)
Issuance of shares through share-based compensation plans | 3,085 | 164
Net cash and cash equivalents provided by (used in) financing activities | 593 | (35,015)
Effect of exchange rate changes on cash and cash equivalents | (1,513) | (636)
Net decrease in cash and cash equivalents | (10,270) | (29,353)
Cash and cash equivalents at beginning of period | 136,720 | 130,673
Cash and cash equivalents at end of period | 126,450 | 101,320
Supplemental disclosure of cash flow information: |  |
Income taxes paid | $ 1,799 | $ 588

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