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Environmental Matters (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 DisposalSite | Dec. 31, 2011 | Dec. 31, 2010
Environmental Matters (Textual) [Abstract] |  |  |
Number of disposal sites | 19 |  |
Environmental expenses | $ 7,000,000 | $ 7,000,000 | $ 7,000,000
Environmental liabilities | 12,616,000 | 13,539,000 |
Capital expenditures related to environmental programs | $ 2,000,000 | $ 3,000,000 | $ 2,000,000

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- Definition Carrying value of the obligation (known or estimated) related to remediation costs as well as normal recurring expenses such as licensing, testing and waste disposal fees. + References No definition available. + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. Also includes normal recurring expenses such as licensing, testing and waste disposal fees. + References No definition available. + Details
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- Details
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- Definition Number of disposal sites. + References No definition available. + Details
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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 25 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6906153&loc=d3e11660-110855 + Details
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