Investments (Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in one year or less	$ 174,304
Amortized Cost, Due after one year through five years	78,754
Amortized Cost, Due after five years through ten years	9,421
Amortized Cost, Amortized Cost Due after ten years	7,083
Amortized Cost	270,975	$ 434,119
Fair Value, Due in one year or less	172,582
Fair Value, Due after one year through five years	77,939
Fair Value, Due after five years through ten years	9,323
Fair Value, Due after ten years	6,644
Fair Value	267,684	426,597
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,413	1,510
Fair Value	$ 1,196	$ 1,374