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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Cash flows from operating activities: |  |
Net income | $ 117,619 | $ 275,359
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation | 33,145 | 34,477
Depreciation | 23,000 | 26,608
Amortization of intangible assets | 9,380 | 11,494
Loss on fair value adjustment of derivatives, net | 0 | 240
Impairment of assets | 1,071 | 10,045
Gain on divestiture | 0 | (90,843)
Deferred income taxes | (2,217) | (147,144)
Change in fair value of earn-out liability | (5,044) | 8,134
Other | 19 | 649
Change in operating assets and liabilities, net of effects of disposition: |  |
Accounts receivable | (4,279) | (10,984)
Unbilled receivables | 20,938 | 81,418
Prepaids and other current assets | (1,694) | 785
Inventories | (12,751) | (13,715)
Income taxes receivable | (15,502) | (83,423)
Accounts payable | 2,295 | (7,436)
Accrued salaries and benefits and other liabilities | (9,666) | (7,596)
Income taxes payable | 17,890 | 61,736
Deferred revenue | 1,259 | (4,783)
Operating lease liabilities | (3,848) | (4,085)
Net cash provided by operating activities | 171,615 | 140,936
Cash flows from investing activities: |  |
Purchases of property, plant, and equipment | (24,208) | (22,454)
Purchases of marketable securities | (278,158) | (298,289)
Maturities of marketable securities | 206,861 | 127,467
Proceeds from sales of marketable securities | 85,722 | 117,798
Proceeds from divestiture | 0 | 106,347
Proceeds from sale of non-marketable equity security | 22,796 | 0
Net cash provided by investing activities | 13,013 | 30,869
Cash flows from financing activities: |  |
Proceeds from issuance of common stock under employee stock plans | 3,447 | 6,453
Payments of taxes on restricted stock units | (40,312) | (36,656)
Payments under installment payment arrangements | (12,699) | (11,323)
Payments for settlement and repurchase of convertible senior notes | 0 | (10,381)
Payments for settlement of warrants | 0 | (10,697)
Payment of deferred purchase consideration from acquisition | (2,450) | (2,450)
Repurchase and retirement of common stock | (113,312) | (100,325)
Net cash used in financing activities | (165,326) | (165,379)
Effect of exchange rate changes on cash and cash equivalents | (89) | (163)
Net increase in cash and cash equivalents | 19,213 | 6,263
Cash and cash equivalents at beginning of period | 94,767 | 125,694
Cash and cash equivalents at end of period | 113,980 | 131,957
Non-cash operating, investing and financing activities: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | 1,510 | 375
Operating lease right-of-use assets obtained in exchange for operating lease obligations | 3,331 | 273
Issuance of common stock in connection with the payment of year 1 earn-out related to the PLDA acquisition | $ 0 | $ 5,022

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