Summary of Investments - Amortized Cost Basis by Year of Origination and Credit Quality Indicator (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 8,134
2022	99
2020	5,175
2019	7,769
2018	19,949
Total	41,126	$ 45,421
Current-period write-offs
2023	0
2022	0
2020	0
2019	0
2018	0
Total	0
Current-period recoveries	0
Current-period net write-offs	0
1-2 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	8,134
2022	99
2020	5,175
2019	7,769
2018	13,361
Total	34,538
3-4 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2020	0
2019	0
2018	6,588
Total	6,588
5 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2020	0
2019	0
2018	0
Total	0
6 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2020	0
2019	0
2018	0
Total	0
7 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2020	0
2019	0
2018	0
Total	$ 0