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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |  |  |  |
Net income |  | $ 80,245 | $ 57,804 | [1] | $ 63,103 | [2]
Adjustments to reconcile net income to cash provided by operating activities: |  |  |  |  |  |
Provision for doubtful accounts |  | 506 | 860 | [2] | 575 | [2]
Depreciation - PP&E |  | 21,229 | 19,264 | [2] | 14,934 | [2]
Depreciation - Rental |  | 8,613 | 9,830 | [2] | 9,373 | [2]
Amortization of intangibles |  | 14,637 | 14,746 | [2] | 5,658 | [2]
Amortization of debt issuance |  | 667 | 634 | [2] | 295 | [2]
Stock-based compensation expense |  | 5,987 | 4,119 | [2] | 3,269 | [2]
Provision for deferred income tax (benefit) expense |  | (1,182) | (855) | [2] | 3,383 | [2]
Gain on sale of property, plant and equipment |  | (3,779) | (1,094) | [2] | (912) | [2]
Changes in operating assets and liabilities, net of acquisitions: |  |  |  |  |  |
Accounts receivable |  | (27,571) | 28,064 | [2] | 11,447 | [2]
Inventories |  | (78,463) | 38,275 | [2] | 393 | [2]
Rental equipment |  | 1,138 | 4,542 | [2] | (20,729) | [2]
Prepaid expenses and other |  | (6,994) | 6,373 | [2] | (4,633) | [2]
Trade accounts payable and accrued liabilities |  | 32,532 | (3,783) | [2] | 6,397 | [2]
Income taxes payable |  | 4,648 | 6,601 | [2] | (4,861) | [2]
Long term tax payable |  | 462 | (3,478) | [2] | (1,082) | [2]
Other assets and liabilities, net |  | (3,008) | 2,431 | [2] | 2,203 | [2]
Net cash provided by operating activities |  | 49,667 | 184,333 | [2] | 88,813 | [2]
Investing Activities |  |  |  |  |  |
Acquisitions, net of cash acquired |  | (17,798) | 0 | [2] | (400,784) | [2]
Purchase of property, plant and equipment |  | (25,263) | (17,874) | [2] | (31,337) | [2]
Proceeds from sale of property, plant and equipment |  | 9,667 | 3,703 | [2] | 2,277 | [2]
Purchase of patents |  | (44) | 0 | [2] | (96) | [2]
Net cash used in investing activities |  | (33,438) | (14,171) | [2] | (429,940) | [2]
Financing Activities |  |  |  |  |  |
Borrowings on bank revolving credit facility |  | 188,000 | 115,000 | [2] | 217,000 | [2]
Repayment on bank revolving credit facility |  | (189,000) | (255,000) | [2] | (157,000) | [2]
Principal payments on long-term debt and capital leases |  | (15,093) | (18,867) | [2] | (122) | [2]
Proceeds from issuance of long-term debt |  | 0 | 0 | [2] | 300,002 | [2]
Debt issuance cost |  | 0 | 0 | [2] | (2,875) | [2]
Dividends paid |  | (6,627) | (6,124) | [2] | (5,626) | [2]
Proceeds from exercise of stock options |  | 1,676 | 1,459 | [2] | 2,573 | [2]
Treasury stock repurchased |  | 0 | 0 | [2] | (4,140) | [2]
Common stock repurchased |  | (1,957) | (710) | [2] | (589) | [2]
Net cash used in financing activities |  | (23,001) | (164,242) | [2] | 349,223 | [2]
Effect of exchange rate changes on cash |  | (1,308) | 1,964 | [2] | 172 | [2]
Net change in cash and cash equivalents |  | (8,080) | 7,884 | [2] | 8,268 | [2]
Cash and cash equivalents at beginning of the year | [2] | 50,195 | 42,311 |  | 34,043 |
Cash and cash equivalents at end of the year |  | 42,115 | 50,195 | [2] | 42,311 | [2]
Cash paid during the year for: |  |  |  |  |  |
Interest |  | 10,248 | 17,049 | [2] | 9,455 | [2]
Income taxes |  | $ 32,865 | $ 17,140 | [2] | $ 23,099 | [2]
[1] | Years ended December 31, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Note 1 to the Consolidated Financial Statements.
[2] | Years ended December 31, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Note 1 to the Consolidated Financial Statements.

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