Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Estimated Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Net Pension Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 5,232
2013	6,655
2014	8,157
2015	9,813
2016	11,457
2017 - 2021	85,357
Net Postretirement Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	1,052
2013	1,139
2014	1,226
2015	1,380
2016	1,481
2017 - 2021	$ 10,258

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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