Investments (Fixed Maturities Securities Proceeds) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Proceeds from maturities/prepayments			$ 877,701	$ 470,550
Fixed maturities \| Available-for-sale
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 403,660	$ 283,241	678,089	316,990
Proceeds from maturities/prepayments	110,426	96,373	230,787	170,458
Gross investment gains from sales and maturities	(652)	8,156	(1,358)	8,508
Gross investment losses from sales and maturities	(22,461)	(9,087)	(41,903)	(11,656)
Write-downs recognized in earnings	(19,519)	0	(19,516)	(2)
(Addition to) release of allowance for credit losses	$ 15,915	$ 2,300	(661)	1,781
Noncash or Part Noncash Divestiture, Amount of Consideration Received			$ (31,200)	$ (16,900)

Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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