Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) vessel	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Liability for Future Policy Benefit, Activity [Line Items]
Amortization	$ 583,589,000	$ 479,125,000	$ 375,052,000
Deferred acquisition costs, impairment	$ 0	0	$ 0
Number of vessels impaired | vessel	2
Impairment of assets held for sale		$ 0
Minimum
Liability for Future Policy Benefit, Activity [Line Items]
Liability for policyholder contract deposits, interest rate	3.00%
Maximum
Liability for Future Policy Benefit, Activity [Line Items]
Liability for policyholder contract deposits, interest rate	4.00%