Investments (Fixed Maturities Securities Proceeds) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Proceeds from maturities/prepayments			$ 668,943	$ 877,701
Fixed maturities | Available-for-sale
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	$ 68,308	$ 403,660	128,681	678,089
Proceeds from maturities/prepayments	193,205	110,426	488,333	230,787
Gross investment gains from sales and maturities	6,777	(652)	9,449	(1,358)
Gross investment losses from sales and maturities	(5,587)	(22,461)	(17,525)	(41,903)
Write-downs recognized in earnings	4	(19,519)	7	(19,516)
(Addition to) release of allowance for credit losses	$ (1,196)	$ 15,915	(154)	(661)
Noncash or part noncash divestiture, amount of consideration received			$ 51,900	$ (31,200)