Derivative Financial Instruments (Schedule Of Derivative Gains And Losses In The Consolidated Statements Of Operations) (Details) (Derivatives Not Designated as Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Financial Instruments [Line Items]
(Losses) Gains Recognized in Income	$ 450	$ 4,055	$ 3,247
Total Return Swap [Member] | Net realized investment gains [Member]
Derivative Financial Instruments [Line Items]
(Losses) Gains Recognized in Income	(2,969)	2,176	0
Interest rate swap agreements [Member] | Other revenue (expense) [Member]
Derivative Financial Instruments [Line Items]
(Losses) Gains Recognized in Income	0	103	567
Equity contracts [Member] | Net realized investment gains [Member]
Derivative Financial Instruments [Line Items]
(Losses) Gains Recognized in Income	$ 3,419	$ 1,776	$ 2,680