Liability For Future Policy Benefits (Revenue and Interest Expense) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Benefit Reserves
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	$ 1,384,137	$ 1,404,102
Interest expense	285,542	276,889
Benefit Reserves | Variable/Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	0	0
Interest expense	0	0
Benefit Reserves | Term Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	1,351,460	1,379,044
Interest expense	279,242	271,091
Benefit Reserves | Fixed Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	32,677	25,058
Interest expense	6,300	5,798
Additional insurance reserves
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	1,168,206	1,020,763
Interest expense	360,309	318,069
Additional insurance reserves | Variable/Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	1,168,206	1,020,763
Interest expense	360,309	318,069
Additional insurance reserves | Term Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	0	0
Interest expense	0	0
Additional insurance reserves | Fixed Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	0	0
Interest expense	0	0
Deferred profit liability
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	3,325
Interest expense	423	444
Deferred profit liability | Variable/Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	0
Interest expense	0	0
Deferred profit liability | Term Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	0
Interest expense	0	0
Deferred profit liability | Fixed Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	3,325
Interest expense	423	444
Deferred Profit Liability Netting
Liability for Future Policy Benefit, Activity [Line Items]
Revenue		(2,002)
Deferred Profit Liability Netting | Variable/Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue		0
Deferred Profit Liability Netting | Term Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue		0
Deferred Profit Liability Netting | Fixed Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Revenue		(2,002)
Revenues
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	2,555,668	2,422,863
Revenues | Variable/Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	1,168,206	1,020,763
Revenues | Term Life
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	1,351,460	1,379,044
Revenues | Fixed Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Revenue	36,002	23,056
Interest Expense
Liability for Future Policy Benefit, Activity [Line Items]
Interest expense	646,274	595,402
Interest Expense | Variable/Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Interest expense	360,309	318,069
Interest Expense | Term Life
Liability for Future Policy Benefit, Activity [Line Items]
Interest expense	279,242	271,091
Interest Expense | Fixed Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Interest expense	$ 6,723	$ 6,242