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Commitments and Contingencies (Details) $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended
		May 22, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) Meter RCEs	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Commitments and Contingencies (Textual)
Purchase of future commitments			$ 69,600			$ 69,600
Purchase commitment due in September 30, 2019			50,700			50,700
Purchase commitment due in September 30, 2020			17,500			17,500
Purchase commitment due in September 30, 2021			1,400			1,400
Total investigation accrual			27,597			27,597		$ 28,069
Number of meters transferred to incumbent utilities | Meter				18,700
RCEs transferred to incumbent utilities | RCEs				10,600
Selling, general and administrative expense	[1]		13,912		$ 19,464	46,379	$ 63,008
Electricity revenues			3,000			3,000
Settlement Agreement [Member]
Commitments and Contingencies (Textual)
Total investigation accrual				$ 7,600				$ 9,000
Class Action Settlement Agreement [Member]
Commitments and Contingencies (Textual)
Restitution to customers						1,700
Liability for the settlement payment			1,700			3,400
Selling, general and administrative expense			1,700			$ 1,700
New Jersey Office and Attorney General [Member]
Commitments and Contingencies (Textual)
Total investigation accrual					$ 1,500		$ 1,500
Restitution to customers		$ 1,200
Agreed to make payments totaling		$ 1,400
New York PSC [Member]
Commitments and Contingencies (Textual)
Percentage of GRE's total meters served						31.10%
Percentage of total RCEs of GRE's customer base						23.20%
Gross revenue			17,100			$ 58,200
Town Square in Ohio [Member]
Commitments and Contingencies (Textual)
Percentage of GRE's total meters served						0.30%
Percentage of total RCEs of GRE's customer base						0.40%
Gross revenue			300			$ 1,200
Restitution payments amount						$ 200
Town Square's Connecticut [Member]
Commitments and Contingencies (Textual)
Percentage of GRE's total meters served						9.50%
Percentage of total RCEs of GRE's customer base						11.60%
Gross revenue			8,400			$ 18,900
IDT Energy [Member]
Commitments and Contingencies (Textual)
Percentage of GRE's total meters served						5.80%
Percentage of total RCEs of GRE's customer base						4.40%
Gross revenue			4,700			$ 13,700
Restitution payments amount						3,000
Genie Retail Energy [Member]
Commitments and Contingencies (Textual)
Aggregate performance bond outstanding			12,700			12,700
Purchase of renewable energy credit			15,200			15,200
BP [Member]
Commitments and Contingencies (Textual)
Payment of trade accounts payable to BP Energy			13,400			$ 13,400
Agreement termination, Description						The agreement's termination date is November 30, 2021
Advance payment			2,000			$ 2,000
Trade Accounts Receivable [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy			38,700			38,700
Restricted Cash [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy			$ 2,500			$ 2,500
[1] Stock-based compensation included in selling, general and administrative expenses

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