Fixed Maturity Securities In An Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) - External Credit Rating, Non Investment Grade $ in Thousands	Mar. 31, 2024 USD ($)
Foreign government
Debt Securities, Available-for-sale [Line Items]
Number of Securities	36
Aggregate Fair Value	$ 93,212
Gross Unrealized Loss	$ 141,742
State and municipal
Debt Securities, Available-for-sale [Line Items]
Number of Securities	5
Aggregate Fair Value	$ 24,438
Gross Unrealized Loss	$ 4,918
Corporate
Debt Securities, Available-for-sale [Line Items]
Number of Securities	25
Aggregate Fair Value	$ 42,772
Gross Unrealized Loss	$ 2,291
Mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities	15
Aggregate Fair Value	$ 4,526
Gross Unrealized Loss	$ 237
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities	4
Aggregate Fair Value	$ 86
Gross Unrealized Loss	$ 70
Special revenue
Debt Securities, Available-for-sale [Line Items]
Number of Securities	85
Aggregate Fair Value	$ 165,034
Gross Unrealized Loss	$ 149,258