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, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Financial Instruments [Line Items]
Gains (Losses) Recognized in Income	$ 6,715	$ 154	$ 15,379
Total Return Swap [Member] | Net realized investment gains [Member]
Derivative Financial Instruments [Line Items]
Gains (Losses) Recognized in Income	(3,783)	(2,137)	11,533
Equity contracts [Member] | Net realized investment gains [Member]
Derivative Financial Instruments [Line Items]
Gains (Losses) Recognized in Income	$ 10,498	$ 2,291	$ 3,846