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HOT MADEN INTEREST (Summarized Financial Information in Associate Balance Sheet Items) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jul. 03, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of associates [line items]        
Current Assets $ 38,359   $ 28,097  
Total assets 660,915   534,882  
Non-current Liabilities 2,807   3,288  
Total liabilities 9,245   7,577  
Company's share of net assets of associate 177,452      
Hot Maden Associate [member]        
Disclosure of associates [line items]        
Current Assets 619    
Non-current assets 591,343    
Total assets 591,962    
Current Liabilities 456    
Non-current Liabilities      
Total liabilities 456    
Net Assets 591,506    
Company's share of net assets of associate $ 177,452 $ 190,700