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Earnings (Loss) Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings (loss) per share attributable to Genie Energy Ltd. common stockholders:
Basic weighted-average number of shares	19,384	21,037	19,413	21,025
Effect of dilutive securities:
Stock options	40
Non-vested restricted Class B common stock	1,665
Diluted weighted-average number of shares	21,089	21,037	19,413	21,025

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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