Unaudited Interim Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed Maturities, Available-for-sale, at fair value (AFS), allowance for credit loss	$ 335	$ 686
Fixed Maturities, Available-for-sale, amortized cost	12,587,739	16,177,891
Fixed maturities, trading, amortized cost	4,077,340	1,017,771
Equity securities, at fair value	242,455	279,096
Commercial mtg and other loans, allowance for credit losses	5,583	7,382
Other invested assets, at fair value	$ 315,990	$ 204,863
Common Stock, Par or Stated Value Per Share	$ 100	$ 100
Common Stock, Shares Authorized	25,000	25,000
Common Stock, Shares, Issued	25,000	25,000
Common Stock, Shares, Outstanding	25,000	25,000