Derivative Financial Instruments (Schedule Of Derivative Gains And Losses In The Consolidated Statements Of Operations) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Financial Instruments [Line Items]
Gains (Losses) Recognized in Income	$ 7,378	$ 6,715	$ 154
Total Return Swap [Member] | Net realized investment gains [Member]
Derivative Financial Instruments [Line Items]
Gains (Losses) Recognized in Income	1,039	(3,783)	(2,137)
Equity contracts [Member] | Net realized investment gains [Member]
Derivative Financial Instruments [Line Items]
Gains (Losses) Recognized in Income	$ 6,339	$ 10,498	$ 2,291