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Derivative Instruments (Carrying Amount and Cumulative Fair Value Hedging Adjustments) (Details) - Fixed Maturity Securities, Available For Sale - Fair Value Hedging - Designated as Hedging Instrument - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Derivative [Line Items]    
Current hedging relationships, amortized cost of hedged item $ 0 $ 389,060
Current hedging relationships, cumulative amount of fair value basis adjustment gain (loss) 0 (39,128)
Discontinued hedging relationships, amortized cost of hedged item 1,372,336 1,594,736
Discontinued hedging relationships, cumulative amount of fair value basis adjustment gain (loss) $ (80,946) $ (94,681)