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HOT MADEN INTEREST (Summarized Financial Information in Associate 100% Basis and Adjustments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [line items]    
Revenue $ 68,275 $ 62,371
Administrative expenses [1] (6,736) (5,031)
Hot Maden Associate [member]    
Disclosure of associates [line items]    
Revenue
Administrative expenses (113)  
Other income 20  
Total net loss (93)  
Company's share of net income (loss) of associate $ (28)  
[1] Equity settled stock based compensation (a non-cash item) is included in administration expenses and project evaluation for the year ended December 31, 2017 $3,785 and December 31, 2016 $3,106.