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Earnings (Loss) Per Share (Tables)
9 Months Ended
Sep. 30, 2013
Earnings (loss) per share attributable to Genie Energy Ltd. common stockholders:  
Weighted-average number of shares used in the calculation of basic and diluted earnings (loss) per share
 
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2013
   
2012
   
2013
   
2012
 
   
(in thousands)
 
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  
Schedule of antidilutive shares excluded from computation of earnings per share
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2013
   
2012
   
2013
   
2012
 
   
(in thousands)
 
Stock options
   
      457       449       457  
Non-vested restricted Class B common stock
   
      1,988       1,785       1,988  
Shares excluded from the calculation of diluted earnings per share
   
      2,445       2,234       2,445