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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income | $ 27,404 | $ 18,587 | $ 15,242
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization of property, plant and equipment and intangible assets | 22,138 | 22,229 | 19,902
Loss on disposal of property, plant and equipment | 268 | 194 | 119
Amortization of other long-term assets | 3,573 | 3,943 | 3,947
Amortization and accretion of deferred loan fees and discounted liabilities | 289 | 359 | 309
Provision for bad debts | 1,171 | 649 | 1,002
Provision for inventory obsolescence | 340 | 1,034 | 738
Loan principal and interest forgiveness | 0 | (672) | 0
Fair value adjustment of contingent consideration | 610 | 758 | 250
Decrease in environmental liability | 0 | (167) | (1,155)
Stock-based compensation | 5,684 | 6,880 | 6,561
Deferred income taxes | (5,278) | (2,090) | 969
Changes in liabilities for uncertain tax positions or unrecognized tax benefits | (1,441) | (1,783) | (2,092)
Change in equity investment fair value | 732 | 790 | (717)
Loss from equity method investment | 0 | 388 | 125
Bargain purchase gain | 0 | (171) | (4,657)
Non-cash lease expense | 68 | 286 | 18
Foreign currency transaction (gains) losses | (29) | (225) | 126
Changes in assets and liabilities associated with operations, net of business combinations: |  |  |
(Increase) decrease in net receivables | (6,447) | (24,347) | 15,407
Decrease in inventories | (29,560) | 8,323 | 6,683
(Increase) decrease in income tax receivable, net | (4,910) | 6,051 | (287)
(Increase) decrease in prepaid expenses and other assets | (3,082) | (4,581) | 140
Increase (decrease) in accounts payable | 1,704 | 8,783 | (8,199)
Increase (decrease) in deferred revenue | 47,551 | 19,280 | 36,803
(Decrease) Increase in accrued program costs | (2,449) | 17,877 | (2,517)
Increase in other payables and accrued expenses | 90 | 3,986 | 1,607
Payment of contingent consideration | (1,321) | 0 | 0
Net cash provided by operating activities | 57,105 | 86,361 | 90,324
Cash flows from investing activities: |  |  |
Capital expenditures | (13,261) | (9,518) | (11,249)
Proceeds from disposal of property, plant and equipment | 84 | 0 | 0
Acquisitions of businesses and product lines | 0 | (10,000) | (19,342)
Intangible assets | (1,293) | (524) | (4,014)
Investment | 0 | 0 | (1,190)
Net cash used in investing activities | (14,470) | (20,042) | (35,795)
Cash flows from financing activities: |  |  |
Payments under line of credit agreement | (254,000) | (186,569) | (168,400)
Borrowings under line of credit agreement | 253,000 | 131,000 | 126,776
Payment of contingent consideration | (68) | (1,301) | (1,227)
Net receipt from the issuance of common stock under ESPP | 837 | 743 | 721
Net receipt from the exercise of stock options | 827 | 172 | 1,603
Net payment from common stock purchased for tax withholding | (2,067) | (2,955) | (2,745)
Repurchase of common stock | (34,002) | (4,579) | 0
Payment of cash dividends | (2,787) | (2,382) | (1,168)
Net cash (used in) provided by financing activities | (38,260) | (65,871) | (44,440)
Net increase in cash and cash equivalents | 4,375 | 448 | 10,089
Effect of exchange rate changes on cash and cash equivalents | (332) | (86) | (747)
Cash and cash equivalents at beginning of year | 16,285 | 15,923 | 6,581
Cash and cash equivalents at end of year | $ 20,328 | $ 16,285 | $ 15,923

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