Fixed Maturity Securities In An Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) - External Credit Rating, Noninvestment Grade $ in Thousands	Mar. 31, 2025 USD ($)
Foreign government
Debt Securities, Available-for-sale [Line Items]
Number of Securities	75
Aggregate Fair Value	$ 182,410
Gross Unrealized Loss	$ 173,141
State and municipal
Debt Securities, Available-for-sale [Line Items]
Number of Securities	28
Aggregate Fair Value	$ 63,624
Gross Unrealized Loss	$ 2,771
Corporate
Debt Securities, Available-for-sale [Line Items]
Number of Securities	6
Aggregate Fair Value	$ 28,784
Gross Unrealized Loss	$ 1,280
Mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities	17
Aggregate Fair Value	$ 4,303
Gross Unrealized Loss	$ 176
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities	1
Aggregate Fair Value	$ 8
Gross Unrealized Loss	$ 2
Special revenue
Debt Securities, Available-for-sale [Line Items]
Number of Securities	127
Aggregate Fair Value	$ 279,129
Gross Unrealized Loss	$ 177,370