Available for Sale Debt Securities - Summary of Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 352,623	$ 352,367
Unrealized Gains	146,857	102,133
Fair Value	499,480	454,500
Available for sale debt securities, current	29,000	18,300
Available for sale debt securities, noncurrent	473,700	437,100
Available for sale debt securities, liabilities noncurrent	(3,220)	(900)
Debt Securities
Debt and Equity Securities, FV-NI [Line Items]
Cost	359,923	359,667
Unrealized Gains	142,777	95,733
Fair Value	502,700	455,400
Available for sale debt securities, current	29,000	18,300
Available for sale debt securities, noncurrent	473,700	437,100
Available for sale debt securities, liabilities noncurrent	0	0
Funding Commitments
Debt and Equity Securities, FV-NI [Line Items]
Cost	(7,300)	(7,300)
Unrealized Gains	4,080	6,400
Fair Value	(3,220)	(900)
Available for sale debt securities, current	0	0
Available for sale debt securities, noncurrent	0	0
Available for sale debt securities, liabilities noncurrent	$ (3,220)	$ (900)

Debt Securities, Available-for-Sale, Adjustment

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Debt Securities, Available-For-Sale, Amortized Cost, Adjustment

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Debt Securities, Available For Sale, Liability, Noncurrent

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Publisher FASB
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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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Amount 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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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