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Significant Accounting Policies (Annuity Deposits (Net of Coinsurance), By Product Type) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
NMOs
Dec. 31, 2019
USD ($)
NMOs
Dec. 31, 2018
USD ($)
NMOs
Product Information [Line Items]      
Fixed index annuities $ 2,309,580 $ 4,603,490 $ 3,898,366
Annual reset fixed rate annuities 7,846 10,665 46,744
Multi-year fixed rate annuities 1,295,843 47,016 22,818
Single premium immediate annuities (SPIA) 33,461 12,002 23,813
Annuity deposits, net of coinsurance $ 3,646,730 $ 4,673,173 $ 3,991,741
Customer Concentration Risk      
Product Information [Line Items]      
National marketing organizations, number of organizations accounting for more than 10% of annuity deposits collected | NMOs 2 2 2
Customer Concentration Risk | National Marketing Organization, Greater than 10%, NMO 1      
Product Information [Line Items]      
National marketing organizations, percent of annuity deposits collected individually 17.00% 24.00% 20.00%
Customer Concentration Risk | National Marketing Organization, Greater than 10%, NMO 2      
Product Information [Line Items]      
National marketing organizations, percent of annuity deposits collected individually 10.00% 14.00% 14.00%