Derivative Financial Instruments (Schedule Of Derivative Gains And Losses In The Consolidated Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments [Line Items]
Gain Recognized in Income (Loss)	$ 896	$ 3,344	$ 2,752	$ 8,941
Interest rate swap agreements [Member] | Other comprehensive income (loss) [Member] | Derivative Contracts for Cash Flow Hedges [Member]
Derivative Financial Instruments [Line Items]
Gain Recognized in Other Comprehensive Income (Loss)	0	141	0	310
Interest rate swap agreements [Member] | Other revenue [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments [Line Items]
Gain Recognized in Income (Loss)	139	521	410	1,384
Equity contracts [Member] | Net realized investment gains (losses) [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments [Line Items]
Gain Recognized in Income (Loss)	$ 757	$ 2,823	$ 2,342	$ 7,557