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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |
Net income | $ 164,031 | $ 102,859 | $ 77,916
Adjustments to reconcile net income to cash provided by operating activities |  |  |
Depreciation and amortization | 6,812 | 4,316 | 4,624
Non-cash lease expense | 5,069 | 3,189 | 2,624
Share-based compensation | 9,903 | 6,796 | 4,520
Loss on sale of disposal of property, plant and equipment | 2 | 212 | 17
Amortization of premium on investment securities | 89 | 320 | 454
Deferred income taxes | (3,715) | 601 | 1,598
Change in operating assets and liabilities: |  |  |
Inventories | (126,651) | (4,621) | (9,883)
Income taxes, prepaid | (945) | 5,169 | (5,169)
Prepaid expenses and other current assets | (9,887) | 1,086 | (1,936)
Other assets | (4,543) | (2,741) | (2,615)
Accounts payable and accrued expenses | 54,380 | 28,010 | 12,111
Net cash flow provided by operating activities | 94,545 | 145,196 | 84,261
Investing Activities |  |  |
Sale and maturities of investment securities | 5,145 | 4,605 | 3,730
Purchase of property and equipment | (34,209) | (5,887) | (10,058)
Net cash flow used in investing activities | (29,064) | (1,282) | (6,328)
Financing Activities |  |  |
Options exercised by executives and directors | 811 | 1,597 | 278
Net shares repurchased for taxes | (6,089) | (551) | (14,092)
Cash dividends paid to stockholders | (63,856) | (53,190) | (35,396)
Stock repurchases | (55,999) | (5,000) | (33,114)
Net cash flow used in financing activities | (125,133) | (57,144) | (82,324)
Foreign currency impact | 112 | (21) | 1
(Decrease) Increase in cash and cash equivalents | (59,540) | 86,749 | (4,390)
Cash and cash equivalents - beginning of the period | 163,723 | 76,974 | 81,364
Cash and cash equivalents - end of period | 104,183 | 163,723 | 76,974
Supplemental disclosure of cash flow information |  |  |
Income taxes paid | 56,758 | 24,636 | 17,314
Dividends declared included in accounts payable | $ 17,186 | $ 13,831 | $ 13,719

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