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Schedule II Financial Information of Registrant - Parent Company Balance Sheet Investments and Equity Supplemental Info (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |
Fixed-maturities, Available-for-sale, Amortized Cost | $ 5,393,623 | $ 4,549,534
Trading Securities, Amortized Cost | 260,773 | 297,505
Equity Securities, Amortized Cost | 145,501 | 125,311
Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Fixed-maturities, Available-for-sale, Amortized Cost | 836,191 | 429,999
Equity Securities, Amortized Cost | $ 0 | $ 13,280
Common Stock, Par or Stated Value Per Share | $ 0.001 | $ 0.001
Common Stock, Shares Authorized | 485,000,000 | 485,000,000
Common Stock, Shares, Issued | 210,130,000 | 219,123,000
Common Stock, Shares, Outstanding | 191,606,000 | 201,164,000
Treasury Stock, Shares | 18,524,000 | 17,959,000

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