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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Operating activities |  |  |  |
Net (loss) income | $ (286,296) | $ 37,291 | $ (286,675) | $ 30,674
Adjustments to reconcile net (loss) income to cash (used in) provided by operating activities |  |  |  |
Stock-based compensation | 31,300 | 30,688 | 59,527 | 60,788
Deferred income taxes |  |  | 169,105 | (28,232)
Loss (gain) on capped call transactions | 18,945 | (26,309) | 49,505 | (7,192)
Amortization of deferred commissions | 10,934 | 9,706 | 28,155 | 21,202
Lease expense |  |  | 7,832 | 5,792
Amortization of intangible assets and depreciation |  |  | 8,175 | 15,504
Foreign currency transaction (gain) loss | (1,713) | 403 | (4,589) | 5,501
Other non-cash |  |  | (3,479) | 3,543
Change in operating assets and liabilities, net |  |  | (32,625) | (88,170)
Cash (used in) provided by operating activities |  |  | (5,069) | 19,410
Investing activities |  |  |  |
Purchases of investments |  |  | (38,489) | (51,601)
Proceeds from maturities and called investments |  |  | 34,912 | 68,798
Sales of investments |  |  | 14,839 | 2,450
Payments for acquisitions, net of cash acquired |  |  | (922) | (4,993)
Investment in property and equipment |  |  | (11,863) | (4,161)
Cash (used in) provided by investing activities |  |  | (1,523) | 10,493
Financing activities |  |  |  |
Proceeds from employee stock purchase plan |  |  | 4,803 | 5,146
Dividend payments to stockholders |  |  | (4,908) | (4,865)
Common stock repurchases |  |  | (41,086) | (60,998)
Cash (used in) financing activities |  |  | (41,191) | (60,717)
Effect of exchange rate changes on cash and cash equivalents |  |  | (2,907) | (1,207)
Net (decrease) in cash and cash equivalents |  |  | (50,690) | (32,021)
Cash and cash equivalents, beginning of period |  |  | 159,965 | 171,899
Cash and cash equivalents, end of period | $ 109,275 | $ 139,878 | $ 109,275 | $ 139,878

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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