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Fair Value Measurements - Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value Disclosures [Abstract] |  |
Less than one year, amortized cost | $ 772,631 | $ 1,448,256
One to three years, amortized cost | 1,319,234 | 1,905,056
Amortized Cost or Carrying Value | 2,091,865 | 3,353,312
Less than one year, aggregate fair value | 773,324 | 1,434,149
One to three years, aggregate fair value | 1,338,695 | 1,917,014
Total aggregate fair value | $ 2,112,019 | $ 3,351,163

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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