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Accrued Environmental Remediation Costs (Details Textual) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Environmental Remediation Costs (Textual)
Long-term portion of the accruals included in other noncurrent liabilities	$ 6,327	$ 5,820

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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