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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
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Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | $ 1,884,512 |  | $ 1,721,391 |  |
Equity securities |  | $ 49,553 |  | $ 50,911 |  |
1.75% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Interest rate on convertible senior notes |  | 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 |  | $ 6,562 |  | $ 10,539 |  |
Recurring Basis [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents | [1] | 269,255 |  | 211,655 |  |
Total |  | 2,160,329 |  | 1,943,585 |  |
Recurring Basis [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 723,626 | [2] | 726,950 | [3] |
Recurring Basis [Member] | Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  |  |  | 11,000 |  |
Recurring Basis [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 321,932 | [4] | 165,055 | [2] |
Recurring Basis [Member] | Debt Securities Issued by U.S. Government Agencies [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 1,000 |  |  |  |
Recurring Basis [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [2] | 811,124 |  | 748,475 |  |
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 | [2] | 27,830 |  | 74,917 |  |
Recurring Basis [Member] | Other Municipal Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [2] |  |  | 5,994 |  |
Recurring Basis [Member] | Publicly Traded Equity Securities [Member] | Other Current Assets [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities | [5] | 6,562 |  | 10,539 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 269,255 |  | 211,655 |  |
Total |  | 1,086,941 |  | 970,669 |  |
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 |  | 811,124 |  | 748,475 |  |
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] | Other Municipal Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  |  |  | 0 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 6,562 |  | 10,539 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 0 |  | 0 |  |
Total |  | 1,073,388 |  | 972,916 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 1.75% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Convertible notes |  | 605,300 |  |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Convertible notes |  | 620,100 |  | 587,300 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0.125% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Convertible notes |  | 42,400 |  | 498,900 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 723,626 |  | 726,950 |  |
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 |  | 321,932 |  | 165,055 |  |
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 |  | 27,830 |  | 74,917 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Municipal Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  |  |  | 5,994 |  |
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 in our condensed consolidated balance sheets.
[2] | Included in short-term investments in our condensed consolidated balance sheets.
[3] | $11.0 million was included in cash and cash equivalents, with the difference included in short-term investments, in our condensed consolidated balance sheets.
[4] | $1.0 million was included in cash and cash equivalents, with the difference included in short-term investments, in our condensed consolidated balance sheets.
[5] | Included in other current assets in our condensed consolidated balance sheets.

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