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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows - operating activities |  |  |
Net income | $ 54,410 | $ 79,486 | $ 72,572
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 18,508 | 10,603 | 19,560
Deferred income taxes | 11,900 | 7,088 | (7,481)
Stock-based compensation expense | 10,830 | 16,689 | 12,760
Accretion expense related to earnout payments | 1,554 | 820 | 486
Impairment charges | 7,246 | 0 | 0
Loss (gain) on marketable securities | (2,918) | (2,406) | (1)
Loss on disposal of property and equipment | 209 | 392 | 135
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable | 6,913 | 4,522 | (36,819)
Accounts payable | (131) | (5,731) | (332)
Accrued expenses | (145,118) | 32,892 | 230,177
Restructuring accrual | 0 | 0 | (5,061)
Deferred revenue | 2,035 | (7,237) | 12,783
Income taxes recoverable (payable), net | (6,692) | (13,606) | 11,377
Retirement and pension plan assets and liabilities | 7,493 | (479) | 1,145
Prepaid expenses | 1,233 | (2,850) | (2,776)
Other assets and liabilities, net | 5,736 | (895) | (37,124)
Net cash provided by (used in) operating activities | (26,792) | 119,288 | 271,401
Cash flows - investing activities |  |  |
Acquisition of businesses, net of cash acquired | (49,858) | 0 | (33,518)
Capital expenditures | (13,433) | (11,134) | (6,240)
Purchases of available for sale investments | (140,982) | (269,824) | (2,323)
Proceeds from sale of available for sale investments | 337,872 | 1,359 | 20,822
Net cash provided by (used in) investing activities | 133,599 | (279,599) | (21,259)
Cash flows - financing activities |  |  |
Cash dividends paid | (12,537) | (12,466) | (12,377)
Payment of employee tax withholding on equity transactions | (4,141) | (3,219) | (3,140)
Repurchases of common stock | (904) | 0 | 0
Acquisition earnout payments | (35,946) | 0 | 0
Net cash used in financing activities | (53,528) | (15,685) | (15,517)
Effect of exchange rates fluctuations on cash, cash equivalents and restricted cash | 3,850 | (13,774) | (5,855)
Net increase (decrease) in cash, cash equivalents and restricted cash | 57,129 | (189,770) | 228,770
Cash, cash equivalents and restricted cash at beginning of period | 355,489 | 545,259 | 316,489
Cash, cash equivalents and restricted cash at end of period | 412,618 | 355,489 | 545,259
Cash paid for |  |  |
Income taxes | $ 22,137 | $ 41,910 | $ 28,623

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