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Investments (Fixed Maturities Securities Proceeds) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Proceeds from maturities/prepayments     $ 572,885 $ 596,626
Fixed maturities | Available-for-sale        
Debt Securities, Available-for-sale [Line Items]        
Proceeds from sales $ 20,268 $ 77,697 352,945 231,106
Proceeds from maturities/prepayments 88,208 125,432 220,109 379,849
Gross investment gains from sales and maturities 24 15 18,279 982
Gross investment losses from sales and maturities (366) (445) (1,856) (3,086)
OTTI recognized in earnings   $ (769)   (2,794)
Write-downs recognized in earnings 0   (693)  
(Addition to) release of allowance for credit losses $ 414   (568)  
Non-cash related proceeds     $ 200 $ 14,300