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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 from operating activities: |  |  |
Net income | $ 547,629 | $ 523,672 | $ 651,642
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 570,776 | 592,754 | 550,632
Stock-based compensation | 328,467 | 217,185 | 202,759
Benefit for deferred income taxes | (22,987) | (104,971) | (47,794)
Amortization of debt discount and issuance costs | 5,341 | 4,395 | 66,025
(Gain) loss on investments | (311) | 15,895 | 10,328
Other non-cash reconciling items, net | 50,221 | 31,063 | 11,495
Changes in operating assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable | (49,203) | (21,214) | (24,096)
Prepaid expenses and other current assets | (18,726) | (20,125) | 4,034
Accounts payable and accrued expenses | (39,825) | (26,499) | 31,523
Deferred revenue | 48 | 16,713 | (2,865)
Other current liabilities | 1,516 | (5,318) | (20,404)
Other non-current assets and liabilities | (24,507) | 51,126 | (28,716)
Net cash provided by operating activities | 1,348,439 | 1,274,676 | 1,404,563
Cash flows from investing activities: |  |  |
Cash paid for business acquisitions, net of cash acquired | (106,171) | (872,091) | (598,825)
Cash paid for asset acquisitions | (120,985) | 0 | 0
Purchases of property and equipment | (457,909) | (241,266) | (328,969)
Capitalization of internal-use software development costs | (272,131) | (217,036) | (216,261)
Purchases of short-and long-term marketable securities | (1,461,890) | (17,975) | (932,604)
Proceeds from sales of short-and long-term marketable securities | 201,585 | 575,522 | 442,133
Proceeds from maturities and redemptions of short-and long-term marketable securities | 375,332 | 156,658 | 991,949
Other, net | (6,069) | (6,122) | (4,322)
Net cash used in investing activities | (1,848,238) | (622,310) | (646,899)
Cash flows from financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 90,000 | 125,000 | 0
Repayment of borrowings under revolving credit facility | (90,000) | (125,000) | 0
Proceeds from the issuance of convertible senior notes, net of issuance costs | 1,247,388 | 0 | 0
Proceeds from the issuance of warrants related to convertible senior notes | 90,195 | 0 | 0
Purchases of note hedges related to convertible senior notes | (236,555) | 0 | 0
Proceeds related to the issuance of common stock under stock plans | 62,979 | 56,462 | 59,632
Employee taxes paid related to net share settlement of stock awards | (66,222) | (82,236) | (99,112)
Repurchases of common stock | (654,046) | (608,010) | (522,255)
Other, net | (360) | (393) | (268)
Net cash provided by (used in) financing activities | 443,379 | (634,177) | (562,003)
Effects of exchange rate changes on cash, cash equivalents and restricted cash | 3,868 | (12,918) | (11,376)
Net (decrease) increase in cash, cash equivalents and restricted cash | (52,552) | 5,271 | 184,285
Cash, cash equivalents and restricted cash at beginning of year | 543,022 | 537,751 | 353,466
Cash, cash equivalents and restricted cash at end of year | 490,470 | 543,022 | 537,751
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes, net of refunds received of $11,006, $15,458 and $14,808 for the years ended December 31, 2023, 2022 and 2021, respectively | 134,478 | 183,900 | 100,533
Cash paid for interest expense | 6,328 | 6,158 | 5,750
Cash paid for operating lease liabilities | 257,961 | 224,898 | 224,085
Non-cash activities: |  |  |
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 333,590 | 202,409 | 218,753
Purchases of property and equipment and capitalization of internal-use software development costs included in accounts payable and accrued expenses | 65,048 | 80,170 | 63,309
Capitalization of stock-based compensation | 83,676 | 33,060 | 36,545
Reconciliation of cash, cash equivalents and restricted cash: |  |  |
Cash and cash equivalents | 489,468 | 542,337 | 536,725
Restricted cash | 1,002 | 685 | 1,026
Cash, cash equivalents and restricted cash | $ 490,470 | $ 543,022 | $ 537,751

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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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