XML 66 R52.htm IDEA: XBRL DOCUMENT v3.3.1.900

Derivative Instruments (Details)	12 Months Ended
	Dec. 31, 2015
Electricity [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	January 2016
Volume	248,000 MWh
Electricity 1 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	February 2016
Volume	772,800 MWh
Electricity 2 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	March 2016
Volume	82,800 MWh
Electricity 3 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	April 2016
Volume	16,800 MWh
Electricity 4 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	July 2016
Volume	160,000 MWh
Electricity 5 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	August 2016
Volume	184,000 MWh
Electricity 6 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Electricity
Settlement Dates	September 2016
Volume	33,600 MWh
Natural Gas [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Natural gas
Settlement Dates	February 2016
Volume	852,500 Dth
Natural Gas 1 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Natural gas
Settlement Dates	April 2016
Volume	200,000 Dth
Natural Gas 2 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Natural gas
Settlement Dates	July 2016
Volume	1,110,000 Dth
Natural Gas 3 [Member]
Summarized volume of IDT Energy's outstanding
Commodity	Natural gas
Settlement Dates	August 2016
Volume	800,000 Dth

X

- Definition

Description of derivative activity settlement date.

+ References

No definition available.

+ Details

Name:	gne_DescriptionOfDerivativeActivitySettlementDate
Namespace Prefix:	gne_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of volume of company energy outstanding.

+ References

No definition available.

+ Details

Name:	gne_ScheduleOfVolumeOfCompanyEnergyOutstandingAbstract
Namespace Prefix:	gne_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The underlying refers to the price on the security, commodity, index, or other variable specified by the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeUnderlying
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Information that would enable users to understand the volume of the entity's derivative activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

Reference 2: 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=56946850&loc=SL5579245-113959

+ Details

Name:	us-gaap_DescriptionOfDerivativeActivityVolume
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricityOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricityTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricityThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricityFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricityFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_ElectricitySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_NaturalGasOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_NaturalGasTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=gne_NaturalGasThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: