Investments in Securities and Fair Value Investments in Securities (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in one year or less	$ 17,573
Due after one year through five years	52,158
Due after five years through ten years	4,958
Due after ten years	822
Total, amortized cost	75,511	$ 112,037
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less	17,736
Due after one year through five years	55,253
Due after five years through ten years	5,436
Due after ten years	1,366
Total	$ 79,791