Discontinued Operations (Narrative) (Details) (DuBois [Member], USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
Estimated liability for potential environmental cleanup and related costs from the sale | $ 1,700,000 | $ 1,700,000 |
Discontinued operations, amount included in other current liabilities | 826,000 | |
Discontinued operations, amount included in other liabilities (long-term) | 901,000 | |
Maximum [Member]
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
Contingent liability for incurring additional environmental cleanup and related costs | $ 14,900,000 |