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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 | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Energy contracts and options [Member] | Direct cost of revenues [Member] |  |  |  |
Effects of derivative instruments on the consolidated statements of operations |  |  |  |
Amount of Gain (Loss) Recognized on Derivatives | $ (426) | $ (17) | $ (394) | $ (101)

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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=7476318&loc=SL5624171-113959 + Details
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- Details
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