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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 363,673 $ 225,506
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 57,482 52,165
Non-cash interest income, net (3,362) (8,290)
Change in deferred revenue 48,785 (3,913)
Deferred income taxes (26,776) 18,020
Share-based compensation 30,635 28,122
Other 914 329
Decrease (Increase) in assets:    
Receivables 27,661 (95,128)
Deferred charges and other assets (20,686) (81,333)
Increase (Decrease) in liabilities:    
Accounts payable 2,408 (2,092)
Customer deposit 0 (76,100)
Accrued compensation and other expenses 325 22,208
Net cash provided by operating activities 481,059 79,494
Cash flows from investing activities:    
Purchases of short-term investments (317,357) (445,434)
Proceeds from maturities and sales of short-term investments 335,682 618,642
Purchases of property and equipment (15,671) (1,928)
Capitalized patent costs (39,591) (33,506)
Long-term investments 0 1,576
Net cash (used in) provided by investing activities (36,937) 139,350
Cash flows from financing activities:    
Payments on long-term debt (1,298) (139,069)
Repurchase of common stock (66,669) (66,726)
Net proceeds from exercise of stock options 7,331 11
Taxes withheld upon restricted stock unit vestings (43,762) (14,816)
Dividends paid (42,641) (30,425)
Net cash used in financing activities (147,039) (251,025)
Net increase (decrease) in cash, cash equivalents and restricted cash 297,083 (32,181)
Cash, cash equivalents and restricted cash, beginning of period 551,547 442,961
Cash, cash equivalents and restricted cash, end of period 848,630 410,780
Other $ 914 $ 329