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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 (loss) | $ 67,808 | $ (345,582) | $ (63,040)
Adjustments to reconcile net income (loss) to cash provided by operating activities |  |  |
Stock-based compensation | 143,352 | 122,210 | 115,947
Amortization of deferred commissions | 59,461 | 53,471 | 41,387
Amortization of intangible assets and depreciation | 18,746 | 18,780 | 28,593
Lease expense | 15,912 | 15,940 | 13,277
Foreign currency transaction (loss) gain | 5,242 | (4,560) | 6,459
Loss on capped call transactions | 1,348 | 57,382 | 23,633
Deferred income taxes | 363 | 168,890 | (75,336)
(Gain) on investments | (10,841) | (6,578) | (89)
(Gain) on repurchases of convertible senior notes | (7,855) | 0 | 0
Other non-cash | 2,255 | 6,735 | 7,819
Change in operating assets and liabilities: |  |  |
Accounts receivable, unbilled receivables, and contract assets | (57,602) | (51,157) | (11,957)
Other current assets | 11,360 | (9,133) | 17,209
Other current liabilities | (8,777) | 529 | (18,726)
Deferred revenue | 45,123 | 62,578 | 41,279
Deferred commissions | (44,529) | (53,857) | (71,451)
Other long-term assets and liabilities | (23,581) | (13,312) | (15,886)
Cash provided by operating activities | 217,785 | 22,336 | 39,118
Investing activities |  |  |
Purchases of investments | (287,287) | (41,015) | (79,121)
Proceeds from maturities and called investments | 242,593 | 66,583 | 105,977
Sales of investments | 10,725 | 23,808 | 61,096
Payments for acquisitions, net of cash acquired | 0 | (922) | (4,993)
Investment in property and equipment | (16,781) | (35,379) | (10,456)
Cash (used in) provided by investing activities | (50,750) | 13,075 | 72,503
Financing activities |  |  |
Repurchases of convertible senior notes | (88,989) | 0 | 0
Dividend payments to stockholders | (9,964) | (9,834) | (9,761)
Proceeds from employee stock purchase plan | 7,744 | 9,172 | 10,554
Proceeds from stock option exercises | 10,821 | 0 | 0
Common stock repurchases for tax withholdings for net settlement of equity awards | (1,916) | (20,620) | (69,925)
Common stock repurchases under stock repurchase program | 0 | (25,707) | (52,711)
Other | 341 | 0 | 0
Cash (used in) financing activities | (81,963) | (46,989) | (121,843)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | 2,701 | (3,333) | (1,712)
Net increase (decrease) in cash, cash equivalents and restricted cash | 87,773 | (14,911) | (11,934)
Cash, cash equivalents, and restricted cash, beginning of period | 145,054 | 159,965 | 171,899
Cash, cash equivalents, and restricted cash, end of period | 232,827 | 145,054 | 159,965
Supplemental disclosures |  |  |
Interest paid on convertible notes | 4,134 | 4,500 | 4,500
Income taxes paid (refunded) | 11,664 | 7,645 | (4,552)
Non-cash investing and financing activity: |  |  |
Investment in property and equipment included in accounts payable and accrued liabilities | 66 | 9,914 | 2,143
Dividends payable | $ 2,515 | $ 2,474 | $ 2,454

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