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Balance Sheet Parentheticals (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fixed-maturities available for sale—at amortized cost $ 4,369,273 $ 4,098,962
Debt Securities, Trading, Amortized Cost 307,981 468,696
Available-for-sale Equity Securities, Amortized Cost Basis 119,408 139,377
Reinvested cash collateral held under securities lending agreements $ 34,767 $ 11,699
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001
Common Stock, Shares Authorized 485,000 485,000
Common Stock, Shares, Issued 220,174 231,132
Common Stock, Shares, Outstanding 202,219 213,473
Treasury Stock, Shares 17,955 17,660