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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 1,910 | $ 45,096 | $ 32,909
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities: |  |  |
Depreciation | 5,965 | 4,848 | 3,990
Amortization of intangibles | 10,445 | 1,534 | 1,940
Share-based compensation | 10,585 | 6,062 | 5,670
Acquired inventory step-up amortization | 15,370 |  |
Provision for doubtful accounts and inventory valuation | 11,202 | 3,335 | 3,608
Deferred income taxes | (4,116) | 2,163 | 17,207
Other, net | 2,098 | 1,265 | 590
Change in operating assets and liabilities net of assets acquired and liabilities assumed in merger: |  |  |
Accounts receivable | (9,721) | 706 | 430
Income taxes | 7,648 | 1,056 | (4,727)
Inventories | (9,338) | (31,545) | (4,218)
Prepaid expenses and other assets | (5,079) | (3,101) | (1,686)
Accounts payable | (12,138) | 3,512 | 3,198
Accrued and other liabilities | (6,685) | 163 | 5,260
Net cash and cash equivalents provided by operating activities | 18,146 | 35,094 | 64,171
Cash flows from investing activities: |  |  |
Purchases of marketable securities | (127,462) | (140,018) | (164,661)
Proceeds from sales of marketable securities | 94,486 | 186,332 | 143,349
Purchases of property, plant and equipment | (6,802) | (7,542) | (10,210)
Cash acquired from merger | 43,882 |  |
Cash advance on convertible note receivable |  | (5,000) |
Purchase of intangible assets |  |  | (1,000)
Net cash and cash equivalents provided by (used in) investing activities | 4,104 | 33,772 | (32,522)
Cash flows from financing activities: |  |  |
Redemption of stock warrants |  |  | (1,025)
Purchases of common stock | (744) | (21,069) |
Tax payments related to shares withheld for share-based compensation plans | (2,540) | (1,921) | (1,358)
Payment of contingent consideration for acquired business | (1,758) | (1,543) | (792)
Issuance of shares through share-based compensation plans | 844 | 624 | 623
Net cash and cash equivalents used in financing activities | (4,198) | (23,909) | (2,552)
Effect of exchange rate changes on cash and cash equivalents | 233 | (339) | 814
Net increase in cash and cash equivalents | 18,285 | 44,618 | 29,911
Cash and cash equivalents at beginning of year | 112,388 | 67,770 | 37,859
Cash and cash equivalents at end of year | 130,673 | 112,388 | 67,770
Supplemental disclosure of cash flow information: |  |  |
Income taxes paid (received), net | $ (3,848) | $ 4,301 | 14,605
Litigation settlement received |  |  | $ 13,000

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