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Parent Corporation Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss | $ 3,969 | $ 0
Fixed income securities, Available-For-Sale, Amortized Cost | $ 6,073,517 | $ 5,879,986
Series B [Member] |  |
Preferred Stock, Liquidation Preference (in dollars per share) | $ 25,000 |
Preferred Stock, Shares Issued | 8,000 |
Treasury Stock, Common |  |
Treasury Stock, Shares | 44,127,109 | 44,023,006
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 | 104,032,912 | 103,484,159
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 |  | 0
Parent Company [Member] |  |
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss | $ 22 |
Fixed income securities, Available-For-Sale, Amortized Cost | $ 272,256 | $ 233,753

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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