Pension Plan and Postretirement Benefits Other Than Pension (Details 2)	Dec. 31, 2012	Dec. 31, 2011
Percentage of plan assets allocation
Cash (as a percent)	11.00%	7.00%
Equity securities:
Domestic (as a percent)	38.00%	43.00%
International (as a percent)	40.00%	38.00%
Private equity (as a percent)	1.00%
Gold bullion (as a percent)	10.00%	12.00%
Percentage of plan assets allocation	100.00%	100.00%

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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The percentage of the fair value of cash securities to the fair value of total plan assets held as of the measurement date.

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The percentage of the fair value of domestic equity securities to the fair value of total plan assets held as of the measurement date.

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- Definition

The percentage of the fair value of foreign equity securities to the fair value of total plan assets held as of the measurement date.

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- Definition

The percentage of the fair value of gold bullion to the fair value of total plan assets held as of the measurement date.

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Represents the percentage of the fair value of private equity to the fair value of total plan assets held as of the measurement date.

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No definition available.

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