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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
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.