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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 18,587 | $ 15,242 | $ 13,601
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization of property, plant and equipment and intangible assets | 22,229 | 19,902 | 18,643
Loss on disposal of property, plant and equipment | 194 | 119 |
Amortization of other long-term assets | 3,943 | 3,947 | 3,983
Accretion of discounted liabilities | (8) | 9 | 72
Amortization of deferred loan fees | 367 | 300 | 224
Provision for bad debts | 649 | 1,002 | 1,035
Loan principal and interest forgiveness | (672) |  |
Fair value adjustment of contingent consideration | 758 | 250 | (4,120)
Decrease in environmental liability | (167) | (1,155) |
Stock-based compensation | 6,880 | 6,561 | 7,160
Increase (decrease) in deferred income taxes | (2,090) | 969 | 2,616
Changes in liabilities for uncertain tax positions or unrecognized tax benefits | (1,783) | (2,092) | 263
Change in equity investment fair value | 790 | (717) |
Loss from equity method investment | 388 | 125 | 209
Bargain purchase gain | (171) | (4,657) |
Net foreign currency adjustment | (225) | 126 | 275
Changes in assets and liabilities associated with operations, net of business combinations: |  |  |
(Increase) decrease in net receivables | (24,347) | 15,407 | (11,513)
Decrease in inventories | 8,130 | 7,421 | 3,817
(Increase) decrease in income tax receivable, net | 6,051 | (287) | (6,855)
(Increase) decrease in prepaid expenses and other assets | (3,354) | 140 | (876)
Increase in net operating lease liability | 286 | 18 | 149
Increase (decrease) in accounts payable | 8,783 | (8,199) | (7,912)
Increase (decrease) in deferred revenue | 19,280 | 36,803 | (13,355)
Increase (decrease) in accrued program costs | 17,877 | (2,517) | 5,797
Increase (decrease) in other payables and accrued expenses | 3,986 | 1,607 | (3,600)
Net cash provided by operating activities | 86,361 | 90,324 | 9,613
Cash flows from investing activities: |  |  |
Capital expenditures | (9,518) | (11,249) | (12,985)
Acquisitions of businesses and product lines | (10,000) | (19,342) | (37,972)
Intangible assets | (524) | (4,014) | (3,880)
Investment |  | (1,190) |
Net cash used in investing activities | (20,042) | (35,795) | (54,837)
Cash flows from financing activities: |  |  |
Net (payments) borrowings under line of credit agreement | (55,569) | (41,624) | 51,900
Payment of contingent consideration | (1,301) | (1,227) | (850)
Net receipt from the issuance of common stock under ESPP | 743 | 721 | 716
Net receipt from the exercise of stock options | 172 | 1,603 | 680
Repurchase of common stock | (4,579) |  | (2,604)
Payment of cash dividends | (2,382) | (1,168) | (2,323)
Net cash (used in) provided by financing activities | (65,871) | (44,440) | 46,406
Net payment from common stock purchased for tax withholding | (2,955) | (2,745) | (1,113)
Net increase in cash and cash equivalents | 448 | 10,089 | 1,182
Effect of exchange rate changes on cash and cash equivalents | (86) | (747) | (769)
Cash and cash equivalents at beginning of year | 15,923 | 6,581 | 6,168
Cash and cash equivalents at end of year | $ 16,285 | $ 15,923 | $ 6,581

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