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Reinsurance and Policy Provisions (Amounts Ceded to North End Re, Effects of Reinsurance) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Ceded Credit Risk [Line Items]        
Annuity product charges $ 58,480 $ 62,277 $ 182,321 $ 185,264
Change in fair value of derivatives (70,701) 205,011 826,484 (409,201)
Total revenues 542,563 798,705 2,580,210 1,394,950
Interest sensitive and index product benefits 817,014 576,147 2,106,590 1,217,358
Change in fair value of embedded derivatives (536,404) (1,732,497) (545,104) (1,855,623)
Total benefits and expenses 345,001 $ (53,049) 2,091,855 $ 588,924
North End Re        
Ceded Credit Risk [Line Items]        
Annuity product charges 6,857   6,857  
Change in fair value of derivatives (12,187)   (12,187)  
Total revenues (5,330)   (5,330)  
Interest sensitive and index product benefits 39,506   39,506  
Change in fair value of embedded derivatives (49,357)   (49,357)  
Total benefits and expenses $ (9,851)   $ (9,851)