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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | $ 806,528 | $ 560,609
Total adjusted cost | 2,423,155 | 1,812,923
Unrealized Gains | 3,198 | 5,654
Unrealized Losses | 4,482 | 4,258
Fair value, subtotal | 2,421,871 | 1,814,319
Current Investments | 683,287 | 734,838
Long-term Investments | 935,720 | 518,624
Fair Value, Inputs, Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | 689,540 | 432,151
Total adjusted cost | 2,275,491 | 1,652,564
Unrealized Gains | 818 | 4,365
Unrealized Losses | 4,455 | 4,090
Fair value, subtotal | 2,271,854 | 1,652,839
Current Investments | 681,887 | 731,339
Long-term Investments | 904,064 | 489,074
Fair Value, Inputs, Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 30,676 | 31,901
Unrealized Gains | 2,380 | 1,289
Unrealized Losses | 27 | 168
Fair Value | 33,029 | 33,022
Current Investments | 1,400 | 3,499
Long-term Investments | 31,656 | 29,550
U.S. Treasury securities | Fair Value, Inputs, Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 1,537,906 | 1,200,658
Unrealized Gains | 818 | 4,352
Unrealized Losses | 4,216 | 4,083
Fair Value | 1,534,508 | 1,200,927
Current Investments | 671,907 | 731,339
Long-term Investments | 865,999 | 469,319
Corporate debt securities | Fair Value, Inputs, Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 48,045 | 19,755
Unrealized Gains |  | 13
Unrealized Losses | 239 | 7
Fair Value | 47,806 | 19,761
Current Investments | 9,980 |
Long-term Investments | 38,065 | 19,755
Corporate debt securities | Fair Value, Inputs, Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 17,001 | 17,401
Unrealized Losses | 27 | 27
Fair Value | 16,974 | 17,374
Current Investments | 1,400 | 999
Long-term Investments | 15,601 | 16,402
Notes receivable | Fair Value, Inputs, Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost | 13,675 | 14,500
Unrealized Gains | 2,380 | 1,289
Unrealized Losses |  | 141
Fair Value | 16,055 | 15,648
Current Investments |  | 2,500
Long-term Investments | 16,055 | 13,148
Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | 116,988 | 128,458
Money market funds | Fair Value, Inputs, Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | 612,339 | 355,872
Time deposits | Fair Value, Inputs, Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | $ 77,201 | $ 76,279

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + 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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