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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 275,359 $ (30,259)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 34,477 25,286
Depreciation 26,608 23,107
Amortization of intangible assets 11,494 11,634
Loss on extinguishment of debt 0 83,626
Loss on fair value adjustment of derivatives, net 240 10,585
Impairment of assets 10,045 0
Gain on divestiture (90,843) 0
Deferred income taxes (147,144) 1,680
Gain on fair value of equity security 0 (3,547)
Change in fair value of earn-out liability 8,134 (1,889)
Other 649 2,187
Change in operating assets and liabilities, net of effects of acquisition/disposition:    
Accounts receivable (10,984) 6,689
Unbilled receivables 81,418 78,914
Prepaids and other current assets 785 984
Inventories (13,715) (5,679)
Income taxes receivable (83,423) 202
Accounts payable (7,436) 8,682
Accrued salaries and benefits and other liabilities (7,596) (10,811)
Income taxes payable 61,736 (15,352)
Deferred revenue (4,783) (1,709)
Operating lease liabilities (4,085) (5,226)
Net cash provided by operating activities 140,936 179,104
Cash flows from investing activities:    
Purchases of property, plant, and equipment (22,454) (12,650)
Acquisition of intangible assets 0 (3,000)
Purchases of marketable securities (298,289) (80,969)
Maturities of marketable securities 127,467 53,358
Proceeds from sales of marketable securities 117,798 276,687
Proceeds from divestiture 106,347 0
Acquisition of business, net of cash acquired 0 (15,932)
Net cash provided by investing activities 30,869 217,494
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 6,453 3,775
Payments of taxes on restricted stock units (36,656) (17,454)
Payments under installment payment arrangements (11,323) (10,472)
Payments for settlement and repurchase of convertible senior notes (10,381) (258,060)
Proceeds from retirement of convertible senior note hedges 0 91,729
Payments for settlement of warrants (10,697) (69,528)
Payment of deferred purchase consideration from acquisition (2,450) 0
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program (100,325) (100,412)
Net cash used in financing activities (165,379) (360,422)
Effect of exchange rate changes on cash and cash equivalents (163) (2,519)
Net increase in cash, cash equivalents and restricted cash 6,263 33,657
Cash, cash equivalents and restricted cash at beginning of period 125,694 108,264
Cash, cash equivalents and restricted cash at end of period 131,957 141,921
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities 26,013 32,540
Issuance of common stock in connection with the payment of year 1 earn-out related to the PLDA Group acquisition 5,022 0
Operating lease right-of-use assets obtained in exchange for operating lease obligations $ 273 $ 5,663