Investments (Schedule of Fixed Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments.
Amortized Cost, Due in one year or less	$ 38,232
Amortized Cost, Due after one year through five years	510,201
Amortized Cost, Due after five years through ten years	458,651
Amortized Cost, Due after ten years through twenty years	53,793
Amortized Cost, Due after twenty years	36,324
Amortized Cost, No maturity	5,053
Amortized Cost	1,102,254	$ 679,921
Estimated Fair Value, Due in one year or less	37,523
Estimated Fair Value, Due after one year through five years	498,497
Estimated Fair Value, Due after five years through ten years	429,377
Estimated Fair Value, Due after ten years through twenty years	49,749
Estimated Fair Value, Due after twenty years	29,174
Estimated Fair Value, No maturity	3,761
Estimated Fair Value	$ 1,048,081	$ 683,296