Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	$ 698,743	$ 748,537
Total adjusted cost	1,690,571	2,221,688
Unrealized Gains	4,740	5,208
Unrealized Losses	0	693
Fair Value, Subtotal	1,695,311	2,226,203
Current Investments	722,531	674,378
Long-term Investments	269,691	799,023
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	610,624	652,568
Total adjusted cost	1,583,353	2,105,555
Unrealized Gains	4,306	4,947
Unrealized Losses	0	693
Fair Value, Subtotal	1,587,659	2,109,809
Current Investments	715,039	670,128
Long-term Investments	257,690	782,859
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	19,099	20,164
Unrealized Gains	434	261
Unrealized Losses	0
Fair Value	19,533	20,425
Current Investments	7,492	4,250
Long-term Investments	12,001	16,164
U.S. Treasury securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	954,297	1,404,777
Unrealized Gains	4,262	4,831
Unrealized Losses		693
Fair Value	958,559	1,408,915
Current Investments	696,607	635,392
Long-term Investments	257,690	769,385
Corporate debt securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	18,432	48,210
Unrealized Gains	44	116
Fair Value	18,476	48,326
Current Investments	18,432	34,736
Long-term Investments		13,474
Corporate debt securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	15,201	16,401
Unrealized Gains	40	11
Fair Value	15,241	16,412
Current Investments	3,200	2,000
Long-term Investments	12,001	14,401
Notes receivable \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjusted cost	3,898	3,763
Unrealized Gains	394	250
Fair Value	4,292	4,013
Current Investments	4,292	2,250
Long-term Investments		1,763
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	88,119	95,969
Money market funds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	531,867	574,689
Time deposits \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	$ 78,757	$ 77,879

Cash And Cash Equivalents At Carrying Value And Debt Securities, Held-to-Maturity, Amortized Cost

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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