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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Apr. 02, 2023
Cash flows from operating activities: |  |
Net income | $ 12,022 | $ 25,615
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Stock-based compensation expense | 13,302 | 16,579
Depreciation of property, plant, and equipment | 5,279 | 3,986
Amortization of intangible assets | 2,813 | 942
Excess and obsolete inventory charges | 471 | 788
Fair Value Adjustment on Acquired Inventories | 1,224 | 0
Amortization of discounts or premiums on investments | 306 | 700
Realized (gain) loss on sale of investments | (2) | 0
Change in deferred income taxes | (3,333) | (10,656)
Accounts receivable | (25,669) | (18,455)
Unbilled revenue | (347) | (173)
Inventories | (10,938) | (5,338)
Prepaid expenses and other current assets | (3,395) | 231
Accounts payable | 7,398 | (192)
Accrued expenses | (470) | (9,942)
Accrued income taxes | 5,258 | 4,721
Deferred revenue and customer deposits | 8,737 | 17,003
Other | 987 | 1,744
Net cash provided by (used in) operating activities | 13,643 | 27,553
Cash flows from investing activities: |  |
Purchases of investments | (233,726) | (46,480)
Maturities and sales of investments | 189,758 | 46,199
Purchases of property, plant, and equipment | (4,061) | (5,507)
Net payments related to business acquisitions (Note 17) | (994) | 0
Net cash provided by (used in) investing activities | (49,023) | (5,788)
Cash flows from financing activities: |  |
Net payments from issuance of common stock under stock plans | (2,861) | (3,055)
Repurchase of common stock | (9,339) | (24,178)
Payment of dividends | (12,888) | (12,091)
Net cash provided by (used in) financing activities | (25,088) | (39,324)
Effect of foreign exchange rate changes on cash and cash equivalents | (3,328) | 356
Net change in cash and cash equivalents | (63,796) | (17,203)
Cash and cash equivalents at beginning of period | 202,655 | 181,374
Cash and cash equivalents at end of period | $ 138,859 | $ 164,171

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