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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
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Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | $ 1,523,267 |  | $ 1,248,124 |  |
Equity securities |  | $ 45,110 |  | $ 50,527 |  |
0.125% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Interest rate on convertible senior notes |  | 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%
Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | $ 4,738 |  | $ 18,205 |  |
Privately Held Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 40,372 |  | 32,322 |  |
Significant Other Observable Inputs (Level 2) [Member] | 0.125% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Fair value of convertible notes |  | 485,200 |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | 0% Notes [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Fair value of convertible notes |  | 577,000 |  |  |  |
Recurring Basis [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents | [1] | 409,877 |  | 541,199 |  |
Total |  | 1,978,254 |  | 1,839,850 |  |
Recurring Basis [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [2] | 760,856 |  | 764,059 |  |
Recurring Basis [Member] | Debt Securities Issued by U.S. Government Agencies [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [2] | 88,374 |  | 120,868 |  |
Recurring Basis [Member] | Debt Securities Issued by the U.S. Treasury [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [2] | 494,122 |  | 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 |  | 173,621 | [3] | 174,464 | [4] |
Recurring Basis [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 23,400 |  | 2,300 |  |
Recurring Basis [Member] | Other Municipal Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities | [2] | 6,294 |  | 6,099 |  |
Recurring Basis [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 4,738 |  | 18,205 |  |
Recurring Basis [Member] | Privately Held Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 40,372 |  | 32,322 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 409,877 |  | 541,199 |  |
Total |  | 904,375 |  | 727,708 |  |
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 |  | 494,122 |  | 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] | Quoted Prices in Active Markets (Level 1) [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 376 |  | 3,875 |  |
Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Privately Held Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 0 |  | 0 |  |
Total |  | 1,029,145 |  | 1,065,490 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 760,856 |  | 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 |  | 88,374 |  | 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 |  | 173,621 |  | 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 |  | 6,294 |  | 6,099 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Privately Held Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Cash equivalents |  | 0 |  | 0 |  |
Total |  | 44,734 |  | 46,652 |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 0 |  | 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 |  | 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 |  | 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 |  | 0 |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Municipal Debt Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Available-for-sale securities |  | 0 |  | 0 |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Publicly Traded Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | 4,362 |  | 14,330 |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Privately Held Equity Securities [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Equity securities |  | $ 40,372 |  | $ 32,322 |  |
[1] | Included in cash and cash equivalents on our condensed consolidated balance sheet.
[2] | Included in short-term investments.
[3] | $23.4 million was included in cash and cash equivalents on our condensed consolidated balance sheet, with the difference included in short-term investments on our condensed consolidated balance sheet.
[4] | $2.3 million was included in cash and cash equivalents on our condensed consolidated balance sheet, with the difference included in short-term investments on our condensed consolidated balance sheet.

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