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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments [Abstract]

Summarized volume of GRE's outstanding contracts and options

Commodity		Settlement Dates		Volume
Electricity		April 2017		16,000 MWh
Electricity		June 2017		153,120 MWh
Electricity		July 2017		334,000 MWh
Electricity		August 2017		420,900 MWh
Electricity		September 2017		75,200 MWh
Electricity		October 2017		241,120 MWh
Electricity		November 2017		213,360 MWh
Electricity		December 2017		283,200 MWh
Electricity		January 2018		362,560 MWh
Electricity		February 2018		329,600 MWh
Electricity		March 2018		179,520 MWh
Electricity		April 2018		67,200 MWh
Electricity		May 2018		70,400 MWh
Electricity		June 2018		67,200 MWh
Electricity		July 2018		67,200 MWh
Electricity		August 2018		73,600 MWh
Electricity		September 2018		60,800 MWh
Electricity		October 2018		147,200 MWh
Electricity		November 2018		134,400 MWh
Electricity		December 2018		128,000 MWh
Natural gas		October 2017		200,000 Dth
Natural gas		November 2017		1,100,000 Dth
Natural gas		December 2017		700,000 Dth
Natural gas		February 2018		888,400 Dth
Natural gas		March 2018		600,000 Dth

Schedule of fair value of outstanding derivative instruments recorded as assets and liability

Asset Derivatives		Balance Sheet Location		March 31, 2017				December 31,  2016
				(in thousands)
Derivatives not designated or not qualifying as hedging instruments:
Energy contracts and options		Other current assets		$	4,842			$	2,651

Liability Derivatives
Derivatives not designated or not qualifying as hedging instruments:
Energy contracts and options		Energy hedging contracts		$	2,546			$	1,727

Effects of derivative instruments on the consolidated statements of operations

				Amount of Gain (Loss) Recognized on Derivatives
				Three Months Ended March 31,
Derivatives not designated or not qualifying as hedging instruments		Location of Gain (Loss) Recognized on Derivatives		2017				2016
				(in thousands)
Energy contracts and options		Cost of revenues		$	(1,248	)		$	361

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- References

No definition available.

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- Definition

Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified 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
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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- Definition

Tabular disclosure of the notional amounts of outstanding derivative positions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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- Definition

Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position.

+ 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=64837297&loc=SL5624171-113959

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