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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