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

X

- 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.

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- Definition

Fair value of available-for-sale debt securities maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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