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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Operating Activities |  |
Net income | $ 58,035 | $ 40,136
Adjustments to reconcile net income to cash provided by operating activities |  |
Depreciation and amortization | 3,363 | 3,519
Share-based compensation | 3,415 | 2,352
Loss on sale of disposal of property, plant and equipment | 17 | 50
Bad debt expense | 3,209 | 642
Amortization of premium on investment securities | 355 | 434
Deferred income taxes | 1,093 | (2,028)
Change in operating assets and liabilities: |  |
Accounts receivable | (3,649) | (526)
Inventory | (13,037) | (23,615)
Income taxes, prepaid | (3,200) | 2,272
Prepaid expenses and other current assets | (232) | 453
Other assets | 188 | 134
Accounts payable and accrued expenses | 15,552 | 21,655
Net cash flow provided by operating activities | 65,109 | 45,478
Investing Activities |  |
Sale and maturities of investment securities | 3,730 | 2,245
Sale of property and equipment |  | 184
Purchase of property and equipment | (9,224) | (3,246)
Net cash flow used in investing activities | (5,494) | (817)
Financing Activities |  |
Options exercised by executives and directors | 279 | 220
Net shares repurchased for employee taxes | (289) | (249)
Cash dividends paid to stockholders | (26,658) | (17,404)
Stock repurchases | (33,114) | (19,996)
Net cash flow used in financing activities | (59,782) | (37,429)
Foreign currency impact | (1) | (2)
Increase in cash and cash equivalents | (168) | 7,230
Cash and cash equivalents - beginning of the period | 81,364 | 75,077
Cash and cash equivalents - end of period | 81,196 | 82,307
Supplemental disclosure of cash flow information: |  |
Income taxes paid | 17,333 | 9,540
Dividends declared included in accounts payable | $ 8,955 | $ 5,981

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