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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Mortgage loans on real estate, allowance for credit losses | $ 21,558 | $ 26,581 | $ 31,029 | $ 19,279 | $ 20,089 |  | $ 17,779
Coinsurance deposits, allowance for credit losses | 2,697 |  | 1,888 |  |  |  |
Retained earnings | $ 2,716,654 |  | $ 2,368,555 |  |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
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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