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Afek Oil and Gas Exploration Activities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Afek Oil and Gas Exploration Activities (Textual)        
Capitalized costs unproved properties $ 1,145    
Write-off of capitalized exploration costs   $ 41,000    
Exploration Expense 851   $ 1,691  
Northern Sites [Member]        
Afek Oil and Gas Exploration Activities (Textual)        
Capitalized costs unproved properties $ 1,100