Investments (Fixed Maturities Securities Proceeds) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Proceeds from maturities/prepayments	$ 397,074	$ 108,725
Fixed maturities \| Available-for-sale
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	274,429	33,749
Proceeds from maturities/prepayments	120,361	74,085
Gross investment gains from sales and maturities	(706)	352
Gross investment losses from sales and maturities	(19,442)	(2,569)
Write-downs recognized in earnings	3	(2)
(Addition to) release of allowance for credit losses	(16,576)	(519)
Noncash or Part Noncash Divestiture, Amount of Consideration Received	$ 2,300	$ 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 maturity, prepayment and call 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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