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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, 2022 USD ($) NMOs | Dec. 31, 2021 USD ($) NMOs | Dec. 31, 2020 USD ($) NMOs
Product Information [Line Items] |  |  |
Fixed index annuities | $ 2,202,688 | $ 3,026,211 | $ 2,309,580
Annual reset fixed rate annuities | 5,535 | 6,000 | 7,846
Multi-year fixed rate annuities | 139,092 | 2,452,994 | 1,295,843
Single premium immediate annuities (SPIA) | 18,935 | 59,816 | 33,461
Annuity deposits, net of coinsurance | $ 2,366,250 | $ 5,545,021 | $ 3,646,730
Customer Concentration Risk | Annuity Deposits Benchmark |  |  |
Product Information [Line Items] |  |  |
National marketing organizations, number of organizations accounting for more than 10% of annuity deposits collected | NMOs | 4 | 2 | 2
Customer Concentration Risk | Annuity Deposits Benchmark | National Marketing Organization, Greater than 10%, NMO 1 |  |  |
Product Information [Line Items] |  |  |
National marketing organizations, percent of annuity deposits collected individually | 22.00% | 14.00% | 17.00%
Customer Concentration Risk | Annuity Deposits Benchmark | National Marketing Organization, Greater than 10%, NMO 2 |  |  |
Product Information [Line Items] |  |  |
National marketing organizations, percent of annuity deposits collected individually | 16.00% | 11.00% | 10.00%
Customer Concentration Risk | Annuity Deposits Benchmark | National Marketing Organization, Greater than 10%, NMO 3 |  |  |
Product Information [Line Items] |  |  |
National marketing organizations, percent of annuity deposits collected individually | 10.00% |  |
Customer Concentration Risk | Annuity Deposits Benchmark | National Marketing Organization, Greater than 10%, NMO 4 |  |  |
Product Information [Line Items] |  |  |
National marketing organizations, percent of annuity deposits collected individually | 10.00% |  |

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