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Significant Accounting Policies - Revenue Recognition / Income Tax (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Interest income	$ 19,300,000	$ 4,900,000	$ 60,900,000
Offering costs	400,000	0	1,600,000
Excise tax expense	$ 16,795,000	$ 1,386,000	$ 2,438,000

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Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of tax expense (benefit) on investment income classified as operating. Excludes realized and unrealized gain (loss) on investment.

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