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Investments (Net Unrealized Gains (Losses) on Investments Reported as a Separate Component of Stockholders' Equity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investments [Abstract]    
Net unrealized losses on investments $ (4,232,154) $ (5,065,422)
Deferred income tax valuation allowance reversal 22,534 22,534
Deferred income tax expense 888,455 1,063,441
Net unrealized losses reported as accumulated other comprehensive loss $ (3,321,165) $ (3,979,447)