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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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