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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |
Net income | $ 637,834 | $ 642,234 | $ 707,755
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation | 44,709 | 36,868 | 42,564
Deferred income taxes | (877) | (1,197) | (31,988)
Depreciation | 87,018 | 84,625 | 71,998
Amortization of intangibles | 104,807 | 81,280 | 58,425
Realized gain on sale of investment | 0 | (742) | 0
In-process research and development and other non-cash charges | 0 | 0 | 10,003
Change in operating assets and liabilities, net of acquisitions: |  |  |
(Increase) decrease in accounts receivable | (66,240) | 49,179 | (137,874)
Decrease (increase) in inventories | 20,943 | (45,443) | (101,902)
Increase in other current assets | (9,537) | (43,164) | (23,074)
Decrease (increase) in other assets | 4,654 | (26,264) | (5,514)
Increase (decrease) in accounts payable and other current liabilities | 61,585 | (79,524) | 60,984
Increase in deferred revenue and customer advances | 6,165 | 10,433 | 12,862
Decrease in other liabilities | (128,938) | (105,476) | (52,578)
Net cash provided by operating activities | 762,123 | 602,809 | 611,661
Cash flows from investing activities: |  |  |
Additions to property, plant, equipment and software capitalization | (142,481) | (160,632) | (175,921)
Asset and business acquisitions, net of cash acquired | 0 | (1,282,354) | 0
Proceeds from (investments in) equity investments, net | (1,489) | 742 | 8,903
Payments for intellectual property licenses | 0 | 0 | (7,535)
Purchases of investments | (3,729) | (1,791) | (11,407)
Maturities and sales of investments | 3,676 | 1,770 | 77,993
Net cash used in investing activities | (144,023) | (1,442,265) | (107,967)
Cash flows from financing activities: |  |  |
Proceeds from debt issuances | 170,000 | 1,450,040 | 205,000
Payments on debt | (900,000) | (670,040) | (145,000)
Payments of debt issuance costs | 0 | (400) | 0
Proceeds from stock plans | 30,366 | 29,792 | 42,801
Purchases of treasury shares | (13,541) | (70,277) | (626,061)
Proceeds from derivative contracts | 16,500 | 15,836 | 13,627
Net cash (used in) provided by financing activities | (696,675) | 754,951 | (509,633)
Effect of exchange rate changes on cash and cash equivalents | 7,920 | (948) | (14,766)
Decrease in cash and cash equivalents | (70,655) | (85,453) | (20,705)
Cash and cash equivalents at beginning of period | 395,076 | 480,529 | 501,234
Cash and cash equivalents at end of period | 324,421 | 395,076 | 480,529
Supplemental cash flow information: |  |  |
Income taxes paid | 183,341 | 243,316 | 160,082
Interest paid | $ 92,096 | $ 94,099 | $ 48,083

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