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Contingent Liabilities and Commitments (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012
Environmental Matters [Abstract]
Accrual for Environmental Loss Contingencies	$ 6,400,000
Commitments For Construction [Abstract]
Commitments for Construction and Aquisition of Property, Plant and Equipment	17,000,000
Minimum [Member]
Environmental Matters [Abstract]
Estimated Capital Costs For Compliance With Hazardous Air Pollutant Regulations	500,000
Maximum [Member]
Environmental Matters [Abstract]
Estimated Capital Costs For Compliance With Hazardous Air Pollutant Regulations	$ 1,000,000

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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- Definition

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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