Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S. federal income tax expense (benefit)	$ 2,730,000	$ 1,604,000	$ 8,495,000	$ 3,998,000
U.S. federal excise tax expense (benefit)	900,000	0	3,600,000	0
Tax (benefit) expense for taxable subsidiaries	(1,000,000.0)	$ 1,600,000	0	$ 4,000,000
Net deferred tax liability	$ 25,100,000		$ 25,100,000		$ 16,000,000