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Fair Value Measurements - Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2023 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unrealized Losses within 12 months, Fair Value | $ 1,267,999
Unrealized Losses within 12 months, Unrealized Losses | (3,271)
Unrealized Losses 12 months or greater, Fair Value | 271,491
Unrealized Losses 12 months or greater, Unrealized Losses | (889)
Total, Fair Value | 1,539,490
Total, Unrealized Losses | (4,160)
U.S. government notes |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unrealized Losses within 12 months, Fair Value | 317,376
Unrealized Losses within 12 months, Unrealized Losses | (1,076)
Unrealized Losses 12 months or greater, Fair Value | 108,739
Unrealized Losses 12 months or greater, Unrealized Losses | (384)
Total, Fair Value | 426,115
Total, Unrealized Losses | (1,460)
Corporate bonds |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unrealized Losses within 12 months, Fair Value | 610,086
Unrealized Losses within 12 months, Unrealized Losses | (1,423)
Unrealized Losses 12 months or greater, Fair Value | 141,943
Unrealized Losses 12 months or greater, Unrealized Losses | (395)
Total, Fair Value | 752,029
Total, Unrealized Losses | (1,818)
Agency securities |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unrealized Losses within 12 months, Fair Value | 340,537
Unrealized Losses within 12 months, Unrealized Losses | (772)
Unrealized Losses 12 months or greater, Fair Value | 20,809
Unrealized Losses 12 months or greater, Unrealized Losses | (110)
Total, Fair Value | 361,346
Total, Unrealized Losses | $ (882)

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