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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities |  |  |
Net (loss) | $ (345,582) | $ (63,040) | $ (61,373)
Adjustments to reconcile net (loss) to cash provided by (used in) operating activities |  |  |
Stock-based compensation | 122,210 | 115,947 | 103,068
Deferred income taxes | 168,890 | (75,336) | (59,777)
Loss (gain) on capped call transactions | 57,382 | 23,633 | (31,697)
Amortization of deferred commissions | 53,471 | 41,387 | 33,302
Lease expense | 15,940 | 13,277 | 16,248
Amortization of intangible assets and depreciation | 18,780 | 28,593 | 21,348
Foreign currency transaction (gain) loss | (4,560) | 6,459 | (3,704)
Other | 157 | 7,730 | 15,007
Change in operating assets and liabilities: |  |  |
Accounts receivable, unbilled receivables, and contract assets | (51,157) | (11,957) | (32,321)
Other current assets | (9,133) | 17,209 | (12,959)
Other current liabilities | 529 | (18,726) | 37,945
Deferred revenue | 62,578 | 41,279 | 43,661
Deferred commissions | (53,857) | (71,451) | (55,175)
Other long-term assets and liabilities | (13,312) | (15,886) | (14,136)
Cash provided by (used in) operating activities | 22,336 | 39,118 | (563)
Investing activities |  |  |
Purchases of investments | (41,015) | (79,121) | (326,549)
Proceeds from maturities and called investments | 66,583 | 105,977 | 28,811
Sales of investments | 23,808 | 61,096 | 1,424
Payments for acquisitions, net of cash acquired | (922) | (4,993) | 0
Investment in property and equipment | (35,379) | (10,456) | (25,369)
Cash provided by (used in) investing activities | 13,075 | 72,503 | (321,683)
Financing activities |  |  |
Proceeds from issuance of convertible senior notes | 0 | 0 | 600,000
Purchase of capped calls related to convertible senior notes | 0 | 0 | (51,900)
Payment of debt issuance costs | 0 | 0 | (14,527)
Proceeds from employee stock purchase plan | 9,172 | 10,554 | 3,039
Dividend payments to stockholders | (9,834) | (9,761) | (9,628)
Common stock repurchases for tax withholdings for net settlement of equity awards | (20,620) | (69,925) | (75,562)
Common stock repurchases under stock repurchase program | (25,707) | (52,711) | (27,974)
Cash (used in) provided by financing activities | (46,989) | (121,843) | 423,448
Effect of exchange rate changes on cash and cash equivalents | (3,333) | (1,712) | 2,334
Net (decrease) increase in cash and cash equivalents | (14,911) | (11,934) | 103,536
Cash and cash equivalents | 145,054 | 159,965 |
Cash and cash equivalents, beginning of period | 159,965 | 171,899 | 68,363
Cash and cash equivalents, end of period | 145,054 | 159,965 | 171,899
Supplemental disclosures |  |  |
Interest paid on convertible notes | 4,500 | 4,500 | 2,338
Income taxes paid (refunded) | 7,645 | (4,552) | 3,377
Non-cash investing and financing activity: |  |  |
Investment in property and equipment included in accounts payable and accrued liabilities | 9,914 | 2,143 | 825
Dividends payable | $ 2,474 | $ 2,454 | $ 2,428

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