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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Statement of Cash Flows [Abstract] |  |
Cash and cash equivalents at beginning of period | $ 1,008,152 | $ 882,325
Cash flows from operating activities: |  |
Net income | 247,643 | 241,804
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 39,556 | 34,400
Amortization of debt discount and fees | 320 | 311
Stock-based compensation | 88,129 | 74,288
Gain on investments, net | (55,394) | (123)
Deferred income taxes | (1,523) | (11,640)
Provisions for losses on receivables | 158 | 214
ROU asset amortization and change in operating lease liabilities | (917) | (1,392)
Other non-cash items | 78 | 99
Changes in operating assets and liabilities, net of effect of acquired businesses: |  |
Receivables | 102,991 | (8,719)
Inventories | (10,689) | 399
Prepaid expenses and other | (15,073) | 56,212
Other assets | (7,535) | (42,084)
Accounts payable and accrued liabilities | (117,291) | (117,915)
Deferred revenue | (23,941) | 40,650
Other long-term liabilities | 6,720 | 897
Net cash provided by operating activities | 253,232 | 267,401
Cash flows from investing activities: |  |
Purchases of investments | (2,095) | (9,055)
Proceeds from the sale and maturity of investments | 43,377 | 102
Purchases of property, plant and equipment | (49,601) | (26,719)
Cash paid in business combinations, net of cash acquired | (71,450) | 0
Net cash used for investing activities | (79,769) | (35,672)
Cash flows from financing activities: |  |
Proceeds from revolving credit facility | 0 | 50,000
Payments on revolving credit facility | 0 | (120,000)
Proceeds from issuance of common stock | 116,725 | 65,370
Stock received for payment of employee taxes on vesting of restricted stock | (151,123) | (67,712)
Payments for repurchases of common stock | (125,006) | (125,010)
Net cash used for financing activities | (159,404) | (197,352)
Effect of exchange rate changes on cash and cash equivalents | (9,793) | 261
Increase in cash and cash equivalents | 4,266 | 34,638
Cash and cash equivalents at end of period | 1,012,418 | 916,963
Supplemental cash flow information: |  |
Cash paid for interest | 4,903 | 5,142
Cash paid for income taxes, net | $ 23,850 | $ 19,814

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