The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

Name:	us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Retirement And Other Postretirement Benefits (Narrative) (Details) (USD $) In Thousands, unless otherwise specified		12 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2012 Scenario, Forecast [Member]	Jun. 30, 2012 Non-Qualified Pension Plans [Member]	Jun. 30, 2011 Non-Qualified Pension Plans [Member]	Jun. 30, 2012 Non-Qualified Pension Plans [Member]	Jun. 30, 2011 Non-Qualified Pension Plans [Member]
Change in Plan Assets
Expected 2012 pension contributions		$ 246,100
Pension contributions made through April 2012	97,600
Remaining estimated pension contributions to be made in 2012		148,500
Net periodic benefit costs			$ 5,100	$ 4,900	$ 10,200	$ 9,800