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Business Segment Information (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

^[2]

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Operating results for the business segments

Revenues

$ 43,915

$ 52,238

$ 39,527

$ 74,429

$ 49,687

^[1]

$ 46,186

$ 48,810

$ 130,348

$ 210,109

$ 275,031

$ 279,174

Income (loss) from operations

$ (3,674)

$ 3,839

$ (4,332)

$ (1,715)

(10,666)

^[1]

(4,107)

$ (4,344)

$ (6,493)

(5,882)

(25,610)

626

Depreciation

428

132

110

Research and development

1,985

5,538

7,357

Exploration

$ 6,583

6,971

$ 4,032

Goodwill impairment

$ 3,600

$ 3,562

Equity in the net loss of AMSO, LLC

$ 397

$ 3,194

Genie Retail Energy [Member]

Operating results for the business segments

Revenues

$ 46,186

210,109

$ 275,031

279,174

Income (loss) from operations

13,542

3,516

25,696

Depreciation

$ 245

$ 24

$ 15

Research and development

Exploration

Goodwill impairment

$ 3,562

Equity in the net loss of AMSO, LLC

Afek Oil And Gas Ltd [Member]

Operating results for the business segments

Revenues

Income (loss) from operations

$ (7,458)

$ (7,294)

$ (4,255)

Depreciation

104

8

2

Research and development

63

144

186

Exploration

$ 6,583

$ 6,971

$ 4,032

Goodwill impairment

Equity in the net loss of AMSO, LLC

Genie Oil and Gas [Member]

Operating results for the business segments

Revenues

Income (loss) from operations

$ (3,058)

$ (6,479)

$ (11,700)

Depreciation

78

99

92

Research and development

$ 1,922

$ 5,394

$ 7,171

Exploration

Goodwill impairment

Equity in the net loss of AMSO, LLC

$ 397

$ 3,194

Corporate [Member]

Operating results for the business segments

Revenues

Income (loss) from operations

$ (8,908)

$ (15,353)

$ (9,115)

Depreciation

$ 1

$ 1

$ 1

Research and development

Exploration

Goodwill impairment

Equity in the net loss of AMSO, LLC

[1]

In the fourth quarter of 2014, loss from operations includes goodwill impairment of $3.6 million and gain on adjustment to estimated contingent payments of $0.2 million.

[2]

Unusually cold weather in the first quarter of 2014 that affected the overall demand for electricity and natural gas for heat caused a significant increase in revenues and direct cost of revenues in the first quarter of 2014 compared to the same period in 2015. The winter's polar vortex resulted in extraordinarily large spikes in the prices of wholesale electricity and natural gas in markets where GRE and other REPs purchased their supply.

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