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Derivative Instruments (Details 1) (Energy contracts and options [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Other current assets [Member] |  |
Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Asset Derivatives, not designated or not qualifying as hedging instruments | $ 857 | $ 1,682
Other current liabilities [Member] |  |
Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Liability Derivatives, not designated or not qualifying as hedging instruments | $ 391 | $ 385

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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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