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Significant Accounting Policies (Annuity Deposits (Net of Coinsurance), By Product Type) (Details) $ in Thousands | 12 Months Ended
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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%

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