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Fair Value Measurements - Fair Value Measurements (Details) - Recurring Basis [Member] - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value Measurements [Abstract]    
Cash equivalents [1] $ 167,298 $ 180,445
Total 2,154,279 2,241,716
Corporate Debt Securities [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities 1,058,068 [2] 1,032,066 [3]
Debt Securities Issued by U.S. Government Agencies [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities [3] 150,590 208,998
Debt Securities Issued by the U.S. Treasury [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities 768,085 [4] 806,724 [3]
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities [3] 6,284 7,524
Other Municipal Debt Securities [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities [3] 698 696
Publicly Traded Equity Securities [Member] | Other Current Assets [Member]    
Fair Value Measurements [Abstract]    
Equity securities [5] 3,256 5,263
Quoted Prices in Active Markets (Level 1) [Member]    
Fair Value Measurements [Abstract]    
Cash equivalents [1] 167,298 180,445
Total 938,639 992,432
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Debt Securities [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities 0 [2] 0 [3]
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 [3] 0 0
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 768,085 [4] 806,724 [3]
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 [3] 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Other Municipal Debt Securities [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities [3] 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Publicly Traded Equity Securities [Member] | Other Current Assets [Member]    
Fair Value Measurements [Abstract]    
Equity securities [5] 3,256 5,263
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements [Abstract]    
Cash equivalents [1] 0 0
Total 1,215,640 1,249,284
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities 1,058,068 [2] 1,032,066 [3]
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by U.S. Government Agencies [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities [3] 150,590 208,998
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 [4] 0 [3]
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 [3] 6,284 7,524
Significant Other Observable Inputs (Level 2) [Member] | Other Municipal Debt Securities [Member]    
Fair Value Measurements [Abstract]    
Available-for-sale securities [3] 698 696
Significant Other Observable Inputs (Level 2) [Member] | Publicly Traded Equity Securities [Member] | Other Current Assets [Member]    
Fair Value Measurements [Abstract]    
Equity securities [5] $ 0 $ 0
[1] Included in cash and cash equivalents.
[2] $39.9 million was included in cash and cash equivalents, with the difference included in short-term investments.
[3] Included in short-term investments.
[4] $36.0 million was included in cash and cash equivalents, with the difference included in short-term investments.
[5] Included in other current assets.