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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Gains (Losses) Recognized in Net Income (Loss)	$ 8,944	$ 2,987	$ 10,656	$ 5,625
Equity contracts [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gains (Losses) Recognized in Net Income (Loss)	8,944	2,472	10,656	3,344
Total Return Swap [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gains (Losses) Recognized in Net Income (Loss)	$ 0	$ 515	$ 0	$ 2,281