Derivative Financial Instruments (Schedule Of Derivative Gains And Losses In The Consolidated Statements Of Operations) (Details) - Derivatives Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Gains (Losses) Recognized in Net Income (Loss)	$ 1,712	$ 2,639
Equity contracts [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gains (Losses) Recognized in Net Income (Loss)	1,712	873
Total Return Swap [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gains (Losses) Recognized in Net Income (Loss)	$ 0	$ 1,766