Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - Available-for-sale - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	$ 4,769	$ 4,149	$ 2,339
Additions to allowance for credit losses not previously recorded	4,268	13,036	2,675
Reductions for securities sold during the period	(5,120)	(1,798)	(28)
Reductions for securities with intent to sell		(16,990)
Addition (reductions) on securities with previous allowance	431	6,372	(837)
Write-downs charged against the allowance	(2,340)
Balance, end of period	2,008	4,769	4,149
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	0	0	0
Additions to allowance for credit losses not previously recorded	0	0	0
Reductions for securities sold during the period	0	0	0
Reductions for securities with intent to sell		0
Addition (reductions) on securities with previous allowance	0	0	0
Write-downs charged against the allowance	0
Balance, end of period	0	0	0
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	5	11	0
Additions to allowance for credit losses not previously recorded	0	329	11
Reductions for securities sold during the period	(1)	(96)	0
Reductions for securities with intent to sell		(324)
Addition (reductions) on securities with previous allowance	(4)	85	0
Write-downs charged against the allowance	0
Balance, end of period	0	5	11
U.S. and Foreign Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	4,755	4,138	2,339
Additions to allowance for credit losses not previously recorded	4,267	12,700	2,664
Reductions for securities sold during the period	(5,118)	(1,702)	(28)
Reductions for securities with intent to sell		(16,666)
Addition (reductions) on securities with previous allowance	436	6,285	(837)
Write-downs charged against the allowance	(2,340)
Balance, end of period	2,000	4,755	4,138
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	0	0	0
Additions to allowance for credit losses not previously recorded	1	0	0
Reductions for securities sold during the period	0	0	0
Reductions for securities with intent to sell		0
Addition (reductions) on securities with previous allowance	0	0	0
Write-downs charged against the allowance	0
Balance, end of period	1	0	0
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	0	0	0
Additions to allowance for credit losses not previously recorded	0	0	0
Reductions for securities sold during the period	0	0	0
Reductions for securities with intent to sell		0
Addition (reductions) on securities with previous allowance	0	0	0
Write-downs charged against the allowance	0
Balance, end of period	0	0	0
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	9	0	0
Additions to allowance for credit losses not previously recorded	0	7	0
Reductions for securities sold during the period	(1)	0	0
Reductions for securities with intent to sell		0
Addition (reductions) on securities with previous allowance	(1)	2	0
Write-downs charged against the allowance	0
Balance, end of period	$ 7	$ 9	$ 0