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Fair Value Measurements - Fair Value Measurements (Details) - Recurring Basis [Member] - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Fair Value Measurements [Abstract] |  |  |  |  |
Cash equivalents | [1] | $ 176,462 |  | $ 180,445 |
Total |  | 2,227,406 |  | 2,241,716 |
Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Cash equivalents | [1] | 176,462 |  | 180,445 |
Total |  | 957,432 |  | 992,432 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Cash equivalents | [1] | 0 |  | 0 |
Total |  | 1,269,974 |  | 1,249,284 |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities |  | 1,066,386 | [2] | 1,032,066 | [3]
Corporate Debt Securities [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities |  | 0 | [2] | 0 | [3]
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities |  | 1,066,386 | [2] | 1,032,066 | [3]
Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 193,822 |  | 208,998 |
Debt Securities Issued by U.S. Government Agencies [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 0 |  | 0 |
Debt Securities Issued by U.S. Government Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 193,822 |  | 208,998 |
Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities |  | 777,981 | [4] | 806,724 | [3]
Debt Securities Issued by the U.S. Treasury [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities |  | 777,981 | [4] | 806,724 | [3]
Debt Securities Issued by the U.S. Treasury [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities |  | 0 | [4] | 0 | [3]
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 9,069 |  | 7,524 |
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 0 |  | 0 |
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 9,069 |  | 7,524 |
Other Municipal Debt Securities [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 697 |  | 696 |
Other Municipal Debt Securities [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 0 |  | 0 |
Other Municipal Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Available-for-sale securities | [3] | 697 |  | 696 |
Other Current Assets [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Equity securities | [5] | 2,989 |  | 5,263 |
Other Current Assets [Member] | Publicly Traded Equity Securities [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Equity securities | [5] | 2,989 |  | 5,263 |
Other Current Assets [Member] | Publicly Traded Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |
Equity securities | [5] | $ 0 |  | $ 0 |
[1] | Included in cash and cash equivalents.
[2] | $29.9 million was included in cash and cash equivalents, with the difference included in short-term investments.
[3] | Included in short-term investments.
[4] | $24.4 million was included in cash and cash equivalents, with the difference included in short-term investments.
[5] | Included in other current assets.

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- Definition Fair value portion 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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