Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Total return swap	$ 9,797	$ 11,525
Non-hedging derivatives [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Total return swap	10,059	11,785
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other liabilities [Member]
Derivative [Line Items]
Total return swap	9,797	11,525
Non-hedging derivatives [Member] | Equity contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Non-hedging derivatives [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivative [Line Items]
Total return swap	$ 262	$ 260