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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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