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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows From Operating Activities: |  |  |
Net income | $ 15,925 | $ 8,036 | $ 9,078
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation and amortization | 11,576 | 10,274 | 9,749
Deferred income taxes | (76) | 3,713 | 1,770
Loss on sale of assets | 19 |  |
Provision for doubtful accounts | 192 | 39 | 167
Provision for excess and obsolete inventory | 682 | 480 | 351
Provision for warranty | (13) | 234 | (138)
Write-off of debt issue costs recorded in interest expense (Note 7) |  |  | 1,052
Debt issue cost amortization recorded in interest expense | 148 | 165 | 380
Restricted stock compensation | 2,643 | 2,026 | 1,893
Other | 57 | (756) | (652)
Changes in operating assets and liabilities, net of acquisition: |  |  |
(Increase) decrease in trade receivables | (4,110) | (4,051) | (3,719)
(Increase) decrease in inventories | (17,327) | 18 | (928)
(Increase) decrease in prepaid expenses and other assets | (835) | (328) | 69
Increase (decrease) in accounts payable | 6,533 | 1,277 | (956)
Increase (decrease) in accrued liabilities and other liabilities | 2,038 | 4,280 | (3,813)
Net cash provided by operating activities | 17,452 | 25,407 | 14,303
Cash Flows From Investing Activities: |  |  |
Consideration paid for acquisitions, net of cash acquired | (77,413) |  | (16,205)
Purchase of property and equipment | (14,333) | (6,201) | (5,188)
Net cash used in investing activities | (91,746) | (6,201) | (21,393)
Cash Flows From Financing Activities: |  |  |
Borrowings (repayments) on lines-of-credit | (454) | (518) | (5,709)
Principal payments of long-term debt | (13,278) | (18,389) | (67,125)
Proceeds from issuance of long-term debt | 83,163 |  | 76,321
Payment of debt issuance costs | (72) |  | (745)
Sale of restricted stock | 1,076 |  |
Dividends paid to stockholders | (1,079) | (959) | (942)
Tax withholdings related to net share settlements of restricted stock | (1,579) | (1,513) | (1,054)
Stock transactions under employee benefit stock plans |  | 1,213 | 834
Net cash provided by (used in) financing activities | 67,777 | (20,166) | 1,580
Effect of foreign exchange rate changes on cash | (400) | 1,067 | (285)
Net (decrease) increase in cash and cash equivalents | (6,917) | 107 | (5,795)
Cash and cash equivalents at beginning of period | 15,590 | 15,483 | 21,278
Cash and cash equivalents at end of period | 8,673 | 15,590 | 15,483
Net cash paid during the period for: |  |  |
Interest | 2,272 | 2,261 | 5,048
Income taxes | $ 7,014 | $ 2,087 | $ 1,148

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