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Business Segment Information (Tables)
 3 Months Ended
Mar. 31, 2017
Business Segment Information [Abstract]  
Summary of operating results for the business segments

(in thousands) GRE  Afek  GOGAS  Corporate  Total 
Three Months Ended March 31, 2017               
Revenues (restated see Note 2) $71,405  $—  $—  $—  $71,405 
Income (loss) from operations (restated see Note 2)  8,974   (1,286)  (97)  (2,395)  5,196 
Exploration  —   851   —   —   851 
                     
Three Months Ended March 31, 2016                    
Revenues (revised see Note 3) $58,879  $—  $—  $—  $58,879 
Income (loss) from operations  10,698   (1,827)  (469)  (2,403)  5,999 
Exploration  —   1,691   —   —   1,691 
Equity in the net loss of AMSO, LLC  —   —   222   —   222 
Summary of total assets for the business segments

(in thousands) GRE  Afek  GOGAS  Corporate  Total 
Total assets:               
March 31, 2017 (restated see Note 2) $89,382  $8,179  $10,487  $16,345  $124,393 
                     
December 31, 2016  87,539   6,685  $12,224   15,365   121,813