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Parent Corporation Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss | $ (9,724) | $ (3,969) | $ 0
Fixed income securities, Available-For-Sale, Amortized Cost | $ 6,490,753 | $ 6,073,517 |
Series B [Member] |  |  |
Preferred Stock, Liquidation Preference (in dollars per share) | $ 25,000 |  |
Treasury Stock, Common |  |  |
Treasury Stock, Shares | 44,266,534 | 44,127,109 |
Common Stock [Member] |  |  |
Common Stock, Par or Stated Value (in dollars per share) | $ 2 | $ 2 |
Common Stock, Shares Authorized | 360,000,000 | 360,000,000 |
Common Stock, Shares, Issued | 104,450,916 | 104,032,912 |
Preferred Stock [Member] |  |  |
Preferred Stock, Par or Stated Value (in dollars per share) | $ 0 | $ 0 |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 |
Preferred Stock, Shares Issued |  | 8,000 |
Parent Company [Member] |  |  |
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss | $ 542 |  |
Fixed income securities, Available-For-Sale, Amortized Cost | $ 317,703 |  |

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