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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Activities |  |  |
Net income | $ 136,161 | $ 101,928 | $ 80,245
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Provision for doubtful accounts | 253 | 424 | 506
Depreciation - PP&E | 23,665 | 23,673 | 21,229
Depreciation - Rental | 8,789 | 7,739 | 8,613
Amortization of intangibles | 15,519 | 15,277 | 14,637
Amortization of debt issuance | 703 | 667 | 667
Stock-based compensation expense | 7,424 | 5,561 | 5,987
Provision for deferred income tax benefit | (4,253) | (2,337) | (1,182)
Gain on sale of property, plant and equipment | (6,621) | (161) | (3,779)
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | (35,293) | (85,055) | (27,571)
Inventories | (10,844) | (37,739) | (78,463)
Rental equipment | (13,930) | (9,196) | 1,138
Prepaid expenses and other | (835) | (6,146) | (6,994)
Trade accounts payable and accrued liabilities | 4,813 | (2,879) | 32,532
Income taxes payable | 6,705 | 2,934 | 4,648
Long term tax payable | (1,147) | (635) | 462
Other assets and liabilities, net | 45 | 475 | (3,008)
Net cash provided by operating activities | 131,154 | 14,530 | 49,667
Investing Activities |  |  |
Acquisitions, net of cash acquired | (27,560) | (2,000) | (17,798)
Purchase of property, plant and equipment | (37,745) | (31,141) | (25,263)
Proceeds from sale of property, plant and equipment | 12,682 | 1,566 | 9,667
Purchase of patents | 0 | (163) | (44)
Net cash used in investing activities | (52,623) | (31,738) | (33,438)
Financing Activities |  |  |
Borrowings on bank revolving credit facility | 183,000 | 222,000 | 188,000
Repayment on bank revolving credit facility | (235,000) | (174,000) | (189,000)
Principal payments on long-term debt and capital leases | (14,948) | (15,031) | (15,093)
Dividends paid | (10,485) | (8,549) | (6,627)
Proceeds from exercise of stock options | 1,586 | 803 | 1,676
Common stock repurchased | (1,034) | (768) | (1,957)
Net cash (used in) provided by financing activities | (76,881) | 24,455 | (23,001)
Effect of exchange rate changes on cash | 3,253 | (2,346) | (1,308)
Net change in cash and cash equivalents | 4,903 | 4,901 | (8,080)
Cash and cash equivalents at beginning of the year | 47,016 | 42,115 | 50,195
Cash and cash equivalents at end of the year | 51,919 | 47,016 | 42,115
Cash paid during the year for: |  |  |
Interest | 25,358 | 14,575 | 10,248
Income taxes | $ 37,330 | $ 35,102 | $ 32,865

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