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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Gain Recognized in Income (Loss)	$ 3,931	$ 1,800	$ 6,038	$ 5,236
Total Return Swap [Member] | Other revenue [Member]
Derivative [Line Items]
Gain Recognized in Income (Loss)	2,581	723	3,744	3,712
Equity contracts [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gain Recognized in Income (Loss)	$ 1,350	$ 1,077	$ 2,294	$ 1,524