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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  | $ 1,721,391 |  | $ 1,248,124 |  |  |  |
Equity securities |  | $ 50,911 |  | $ 50,527 |  |  |  |
0.125% Notes [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Interest rate on convertible senior notes |  | 0.125% |  | 0.125% |  |  | 0.125% | 0.125%
0% Notes [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Interest rate on convertible senior notes |  | 0.00% |  | 0.00% |  | 0.00% |  | 0.00%
Recurring Basis [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Cash equivalents | [1] | $ 211,655 |  | $ 541,199 |  |  |  |
Total |  | 1,943,585 |  | 1,807,528 |  |  |  |
Recurring Basis [Member] | Other Current Assets [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Equity securities | [2] | 10,539 |  | 18,205 |  |  |  |
Recurring Basis [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  | 726,950 | [3] | 764,059 | [4] |  |  |
Recurring Basis [Member] | Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  | 11,000 |  | 2,300 |  |  |  |
Recurring Basis [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities | [4] | 165,055 |  | 120,868 |  |  |  |
Recurring Basis [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities | [4] | 748,475 |  | 182,634 |  |  |  |
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 |  | 74,917 | [4] | 174,464 | [5] |  |  |
Recurring Basis [Member] | Other Municipal Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities | [4] | 5,994 |  | 6,099 |  |  |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Cash equivalents |  | 211,655 |  | 541,199 |  |  |  |
Total |  | 970,669 |  | 727,708 |  |  |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Other Current Assets [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Equity securities |  | 10,539 |  | 3,875 |  |  |  |
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 |  | 748,475 |  | 182,634 |  |  |  |
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 |  | 0 |  |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Cash equivalents |  | 0 |  | 0 |  |  |  |
Total |  | 972,916 |  | 1,065,490 |  |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0.125% Notes [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Fair value of convertible notes |  | 498,900 |  |  |  |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0% Notes [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Fair value of convertible notes |  | 587,300 |  |  |  |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Current Assets [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Equity securities |  | 0 |  | 0 |  |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  | 726,950 |  | 764,059 |  |  |  |
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 |  | 165,055 |  | 120,868 |  |  |  |
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 |  | 74,917 |  | 174,464 |  |  |  |
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 |  | 6,099 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Cash equivalents |  |  |  | 0 |  |  |  |
Total |  | $ 0 |  | 14,330 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Current Assets [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Equity securities |  |  |  | 14,330 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  | 0 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  | 0 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  | 0 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [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 |  |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Municipal Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  | $ 0 |  |  |  |
[1] | Included in cash and cash equivalents in our consolidated balance sheets.
[2] | Included in other current assets in our consolidated balance sheets.
[3] | $11.0 million included in cash and cash equivalents in our consolidated balance sheets, with the difference included in short-term investments in our consolidated balance sheets.
[4] | Included in short-term investments.
[5] | $2.3 million included in cash and cash equivalents in our consolidated balance sheets, with the difference included in short-term investments in our consolidated balance sheets.

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