Investments in Securities and Fair Value Investments in Securities (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in one year or less	$ 24,328
Due after one year through five years	27,348
Due after five years through ten years	10,597
Due after ten years	833
Total, amortized cost	63,106	$ 53,775
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less	24,430
Due after one year through five years	27,530
Due after five years through ten years	10,785
Due after ten years	1,102
Total	$ 63,847