Investments (Fixed Maturities Securities Proceeds) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Proceeds from maturities/prepayments			$ 1,508,920	$ 668,943
Fixed maturities | Available-for-sale
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	$ 321,870	$ 68,308	428,025	128,681
Proceeds from maturities/prepayments	698,470	193,205	1,135,913	488,333
Gross investment gains from sales and maturities	9,407	6,777	10,344	9,449
Gross investment losses from sales and maturities	(16,340)	(5,587)	(24,472)	(17,525)
Write-downs recognized in earnings	0	4	0	7
(Addition to) release of allowance for credit losses	$ (1,698)	$ (1,196)	(1,340)	(154)
Noncash or part noncash divestiture, amount of consideration received			$ (55,000)	$ 51,900