Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative Financial Instruments [Line Items]
Liability Derivatives	$ 4,854	$ 1,323
Not Designated as Hedging Instrument [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Liability Derivatives	3	123
Not Designated as Hedging Instrument [Member] | Interest rate swap agreements [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Liability Derivatives	$ 4,851	$ 1,200