Commitments And Contingencies (Estimated Cost To Replace All Such Annuities For Which The Company Was Contingently Liable) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
The Prudential Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 140,773	$ 141,703
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 35,128	$ 35,082