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Derivative Instruments (Details 2) (Energy contracts and options [Member], Direct cost of revenues [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Energy contracts and options [Member] | Direct cost of revenues [Member] |  |  |  |
Effects of derivative instruments on the consolidated statements of operations |  |  |  |
Location of Gain (Loss) Recognized on Derivatives | $ (65) | $ 75 | $ (100) | $ 32

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Details
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