Fixed Maturity Securities In An Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) - External Credit Rating, Non Investment Grade $ in Thousands	Sep. 30, 2024 USD ($)
Foreign government
Debt Securities, Available-for-sale [Line Items]
Number of Securities	62
Aggregate Fair Value	$ 146,049
Gross Unrealized Loss	$ 163,081
State and municipal
Debt Securities, Available-for-sale [Line Items]
Number of Securities	5
Aggregate Fair Value	$ 28,143
Gross Unrealized Loss	$ 1,894
Corporate
Debt Securities, Available-for-sale [Line Items]
Number of Securities	9
Aggregate Fair Value	$ 20,185
Gross Unrealized Loss	$ 568
Mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities	15
Aggregate Fair Value	$ 2,930
Gross Unrealized Loss	$ 143
Special revenue
Debt Securities, Available-for-sale [Line Items]
Number of Securities	91
Aggregate Fair Value	$ 197,307
Gross Unrealized Loss	$ 165,686