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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Operating Activities |  |
Net income | $ 42,133 | $ 26,355
Adjustments to reconcile net income to cash provided by operating activities |  |
Depreciation and amortization | 2,156 | 2,689
Share-based compensation | 2,245 | 1,635
Loss on sale of disposal of property, plant and equipment | 17 | 50
Realized (gain) loss on investment securities, net | 8 | (21)
Amortization of premium on investment securities | 249 | 298
Deferred income taxes | 375 | (1,036)
Change in operating assets and liabilities: |  |
Accounts receivable | 33 | 199
Inventory | (9,585) | (6,670)
Income taxes, prepaid | (1,365) | 2,673
Prepaid expenses and other current assets | (3,052) | 368
Other assets | 35 | 33
Accounts payable and accrued expenses | 13,963 | 11,958
Net cash flow provided by operating activities | 47,212 | 38,531
Investing Activities |  |
Sale and maturities of investment securities | 2,430 | 1,200
Sale of property and equipment |  | 184
Purchase of property and equipment | (6,972) | (2,094)
Net cash flow used in investing activities | (4,542) | (710)
Financing Activities |  |
Options exercised by executives and directors | 279 | 62
Net shares repurchased for employee taxes | (256) | (215)
Cash dividends paid to stockholders | (17,749) | (11,673)
Stock repurchases | (9,998) | (19,996)
Net cash flow used in financing activities | (27,724) | (31,822)
Foreign currency impact | 1 |
Increase in cash and cash equivalents | 14,947 | 5,999
Cash and cash equivalents - beginning of the period | 81,364 | 75,077
Cash and cash equivalents - end of period | 96,311 | 81,076
Supplemental disclosure of cash flow information: |  |
Income taxes paid | 11,338 | 4,380
Dividends declared included in accounts payable | $ 9,102 | $ 5,914

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