Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Financial Instruments [Line Items]
Asset Derivatives	$ 346	$ 0
Non-hedging derivatives [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	346		0
Liability Derivatives	0	278
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Liability Derivatives	0	103
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other Assets [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	346		0
Liability Derivatives	0	0
Non-hedging derivatives [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	0		0
Liability Derivatives	0	175
Interest Rate Swap [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	$ 0		$ 0