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Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments [Abstract]

Summary of volume of GRE's outstanding contracts and options

Settlement Dates		Volume
		Electricity (In MWH)				Gas (in Dth)
October 2018			96,960				—
November 2018			68,880				538,650
December 2018			86,800				554,600
January 2019			173,360				812,530
February 2019			157,120				694,825
March 2019			36,960				627,875
April 2019			3,520				36,175
May 2019			3,520				30,450
June 2019			3,200				24,975
July 2019			7,040				20,100
August 2019			7,040				18,200
September 2019			3,200				17,750
October 2019			3,680				16,900
November 2019			3,200				18,575
December 2019			3,360				18,625
Calendar 2020			—				112,375
Calendar 2021			—				19,850

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

Asset Derivatives		Balance Sheet Location		September 30, 2018				December 31,  2017
				(in thousands)
Derivatives not designated or not qualifying as hedging instruments:
Energy contracts and options		Other current assets		$	2,485			$	4,358
Liability Derivatives
Derivatives not designated or not qualifying as hedging instruments:
Energy contracts and options		Other current liabilities		$	701			$	1,228

Schedule of derivative instruments on the consolidated statements of income

				Amount of Gain (Loss) Recognized on Derivatives
Derivatives not designated or not qualifying as		Location of Gain (Loss) Recognized		Three Months Ended September 30,								Nine Months Ended September 30,
hedging instruments		on Derivatives		2018				2017				2018				2017
				(in thousands)
Energy contracts and options		Cost of revenues		$	1,462			$	(763	)		$	1,911			$	(3,482	)

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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.

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-Name Accounting Standards Codification
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Tabular disclosure of the notional amounts of outstanding derivative positions.

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Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument.

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-Name Accounting Standards Codification
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