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Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) state | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of states in which entity is licensed to sell insurance products | state | 50 |  |  |  |
Mortgage loans on real estate, allowance for credit losses | $ 36,972 | $ 24,024 | $ 31,029 |  |
Coinsurance deposits, allowance for credit losses | 8,737 | 2,264 |  |  |
Retained earnings | 4,685,593 | 2,839,254 |  |  |
Estimated impact to stockholders' equity at January 1, 2021 | 2,370,750 | 7,738,717 | $ 6,348,988 |  | $ 4,426,522
Accumulated other comprehensive income (loss) | $ (3,746,230) | $ 3,192,547 |  |  |
Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of days past due, non-accrual status | 90 days |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products | 1.45% | 1.45% | 1.45% |  |
Minimum | Fixed Maturity Securities, Available For Sale |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Investment maturity period | 1 year |  |  |  |
Minimum | Other Invested Assets - COLI, Equity Securities, Short-Term Debt Securities |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Investment maturity period | 3 months |  |  |  |
Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products | 2.65% | 2.65% | 2.65% |  |
Maximum | Other Invested Assets - COLI, Equity Securities, Short-Term Debt Securities |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Investment maturity period | 12 months |  |  |  |
Maximum | Other Invested Assets - Short-Term Loans and Collateral Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Investment maturity period | 1 year |  |  |  |
Maximum | Cash and Cash Equivalents |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Investment maturity period | 3 months |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  | $ 7,200 |  |
Estimated impact to stockholders' equity at January 1, 2021 |  | $ 1,761,321 | (9,295) |  |
Accumulated other comprehensive income (loss) |  |  | $ 1,800,000 |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Mortgage loans on real estate, allowance for credit losses |  |  |  | $ 8,600 |
Coinsurance deposits, allowance for credit losses |  |  |  | 3,200 |
Retained earnings |  |  |  | $ (9,300) |

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