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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
	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

X

- 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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