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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income | $ 215,525 | $ 279,881 | $ 176,186
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation expense | 54,505 | 43,774 | 42,661
Depreciation of property, plant, and equipment | 16,347 | 16,616 | 22,139
Loss (gain) on disposal of property, plant, and equipment | 19 | 33 | 1,817
Amortization of intangible assets | 3,274 | 3,667 | 4,364
Intangible asset impairment charges | 0 | 0 | 19,571
Non-cash, loss from catastrophes | 46,372 | 0 | 0
Excess and obsolete inventory charges | 3,084 | 2,573 | 9,908
Operating lease asset impairment charges | 0 | 0 | 3,427
Amortization of discounts or premiums on investments | 4,968 | 4,887 | 1,274
Realized (gain) loss on sale of investments | 182 | (236) | (4,119)
Revaluation of contingent consideration | 0 | 0 | (114)
Change in deferred income taxes | (27,338) | (3,118) | (3,353)
Accounts receivable | 3,454 | (4,503) | (21,285)
Unbilled revenue | 1,806 | 1,637 | (848)
Inventories | (48,934) | (54,920) | (10,319)
Prepaid expenses and other current assets | (6,998) | (32,342) | (9,909)
Accounts payable | (17,277) | 27,828 | (1,688)
Accrued expenses | 2,056 | 16,861 | 24,542
Accrued income taxes | (444) | (6,401) | (22,973)
Deferred revenue and customer deposits | 4,886 | 14,417 | 6,571
Other | (12,081) | 3,411 | 4,548
Net cash provided by operating activities | 243,406 | 314,065 | 242,400
Cash flows from investing activities: |  |  |
Purchases of investments | (233,720) | (668,053) | (922,867)
Maturities and sales of investments | 253,983 | 430,969 | 1,104,605
Purchases of property, plant, and equipment | (19,667) | (15,455) | (13,303)
Net payments related to business acquisitions | (5,050) | 0 | 1,004
Net cash provided by (used in) investing activities | (4,454) | (252,539) | 169,439
Cash flows from financing activities: |  |  |
Net payments from issuance of common stock under stock plans | 9,861 | 63,292 | 125,715
Repurchase of common stock | (204,314) | (161,652) | (51,036)
Payment of dividends | (45,921) | (43,263) | (390,508)
Payment of contingent consideration | 0 | 0 | 1,039
Net cash used in financing activities | (240,374) | (141,623) | (316,868)
Effect of foreign exchange rate changes on cash and cash equivalents | (3,365) | (2,815) | 2,671
Net change in cash and cash equivalents | (4,787) | (82,912) | 97,642
Cash and cash equivalents at beginning of year | 186,161 | 269,073 | 171,431
Cash and cash equivalents at end of year | $ 181,374 | $ 186,161 | $ 269,073

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