Pension And Other Postretirement Benefits (Schedule Of Expected Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 16,785
2013	17,454
2014	17,837
2015	18,473
2016	19,050
Years 2017 - 2021	105,586
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	3,181
2013	3,126
2014	3,191
2015	3,243
2016	3,385
Years 2017 - 2021	$ 17,372

The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant