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Schedule II Financial Information of Registrant Parent Company Parenthetical (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Fixed-maturities, Available-for-sale, Amortized Cost $ 4,549,534 $ 4,098,962
Trading securities - at amortized cost 297,505 468,696
Equity securities available for sale—at cost 125,311 139,377
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Fixed-maturities, Available-for-sale, Amortized Cost 429,999 320,746
Trading securities - at amortized cost 0 55,948
Equity securities available for sale—at cost $ 13,280 $ 29,387
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 219,123,000 231,132,000
Common Stock, Shares, Outstanding 201,164,000 213,473,000
Treasury Stock, Shares 17,959,000 17,660,000