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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
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Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | $ 1,801,576 |  | $ 1,964,890 |  |
Equity securities |  | $ 47,877 |  | $ 49,292 |  |
1.75% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Interest rate on convertible senior notes |  | 1.75% |  | 1.75% |  | 1.75%
0% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Interest rate on convertible senior notes |  | 0.00% |  | 0.00% |  | 0.00%
0.125% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Interest rate on convertible senior notes |  | 0.125% |  | 0.125% |  | 0.125%
Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | $ 6,854 |  | $ 6,301 |  |
Recurring Basis [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents | [1] | 212,489 |  | 185,424 |  |
Total |  | 2,020,919 |  | 2,156,615 |  |
Recurring Basis [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 769,260 | [2] | 801,228 | [3] |
Recurring Basis [Member] | Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 16,900 |  | 33,000 |  |
Recurring Basis [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [4] | 236,580 |  | 334,828 |  |
Recurring Basis [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [4] | 776,021 |  | 807,679 |  |
Recurring Basis [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [4] | 19,715 |  | 21,155 |  |
Recurring Basis [Member] | Publicly Traded Equity Securities [Member] | Other Current Assets [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities | [5] | 6,854 |  | 6,301 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 212,489 |  | 185,424 |  |
Total |  | 995,364 |  | 999,404 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 776,021 |  | 807,679 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 6,854 |  | 6,301 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 0 |  | 0 |  |
Total |  | 1,025,555 |  | 1,157,211 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 1.75% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Convertible notes |  | 634,400 |  | 661,100 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Convertible notes |  | 649,600 |  | 667,800 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0.125% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Convertible notes |  | 43,400 |  | 42,400 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 769,260 |  | 801,228 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 236,580 |  | 334,828 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 19,715 |  | 21,155 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | $ 0 |  | $ 0 |  |
[1] | Included in cash and cash equivalents.
[2] | $16.9 million was included in cash and cash equivalents, with the difference included in short-term investments.
[3] | $33.0 million was included in cash and cash equivalents, with the difference included in short-term investments.
[4] | Included in short-term investments.
[5] | Included in other current assets.

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