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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash Flows From Operating Activities: |  |
Net income | $ 4,470 | $ 4,198
Adjustments to reconcile net income to net cash provided by operating activities |  |
Depreciation and amortization | 3,659 | 2,791
Deferred income taxes | (297) | 2,822
Stock compensation expense | 674 | 496
Debt issue cost amortization recorded in interest expense | 43 | 37
Other | 347 | 609
Changes in operating assets and liabilities, net of acquisition: |  |
Trade receivables | (10,941) | (8,231)
Inventories | 1,291 | (3,887)
Prepaid expenses and other assets | (161) | (1,408)
Accounts payable | 490 | 5,479
Accrued liabilities | (2,014) | (1,211)
Net cash (used in) provided by operating activities | (2,439) | 1,695
Cash Flows From Investing Activities: |  |
Purchase of property and equipment | (2,505) | (2,222)
Cash paid for acquisitions |  | (13,312)
Net cash used in investing activities | (2,505) | (15,534)
Cash Flows From Financing Activities: |  |
Borrowings on long term debt | 6,568 | 14,500
Principal payments of long-term debt |  | (4,350)
Stock transactions under employee benefit stock plans | (63) | 849
Net cash provided by financing activities | 6,505 | 10,999
Effect of foreign exchange rate changes on cash | (50) | 253
Net increase (decrease) increase in cash and cash equivalents | 1,511 | (2,587)
Cash and cash equivalents at beginning of period | 8,673 | 15,590
Cash and cash equivalents at end of period | $ 10,184 | $ 13,003

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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