Quarterly report pursuant to Section 13 or 15(d)

EQUITY INVESMENTS (Narrative) (Details)

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EQUITY INVESMENTS (Narrative) (Details)
$ / shares in Units, a in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
a
$ / shares
shares
Sep. 30, 2018
USD ($)
May 31, 2018
May 01, 2018
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 43,082,000 $ (12,858,000) $ 164,391,000 $ (35,282,000)    
Distributions from equity method investments     1,945,000 446,000    
Mammoth Energy Services LP            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, impairment $ 35,500,000   160,800,000      
Distributions from equity method investments     $ 2,500,000      
Equity method investment, ownership interest (in shares) | shares 9,829,548   9,829,548      
Share dividend (in usd per share) | $ / shares     $ 0.125      
Approximate fair value, quoted market price $ 24,400,000   $ 24,400,000      
Tatex Thailand II, LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 0 (137,000) $ (2,085,000) (241,000)    
Equity method investment, ownership interest, percent 23.50%   23.50%      
Grizzly Oil Sands ULC            
Schedule of Equity Method Investments [Line Items]            
Gas and oil area, reserve (in acres) | a     830      
Loss (income) from equity method investments, net $ 41,000 275,000 $ 380,000 833,000    
Equity method investment, ownership interest, percent 24.9999%   24.9999%      
Equity method investment, impairment     $ 0 0    
Equity method investment, amount of cash calls, based on proportionate ownership interest     400,000      
Equity method investments, increase (decrease) due to foreign currency translation adjustment $ (2,000,000.0) 2,900,000 5,200,000 (5,700,000)    
Windsor Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 0 0 $ 0 (9,000)    
Equity method investment, ownership interest, percent 22.50%   22.50%      
Distributions from equity method investments     $ 0      
Mammoth Energy Services LP            
Schedule of Equity Method Investments [Line Items]            
Equity method investments, increase (decrease) due to foreign currency translation adjustment $ (100,000) 100,000 100,000 (200,000)    
Strike Force Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 0 $ 0 $ 0 $ (693,000)    
Equity method investment, ownership interest, percent 0.00%   0.00%     25.00%
Phu Horm Field | Apico Llc            
Schedule of Equity Method Investments [Line Items]            
Gas and oil area, reserve (in acres) | a     108      
Apico Llc | Tatex Thailand II, LLC            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage 8.50%   8.50%      
Apico Llc | Tatex Thailand II, LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net     $ 1,900,000      
Investee | Mammoth Energy Services LP            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership interest, percent 21.80%   21.80%      
Investee | Strike Force Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership interest, percent         25.00%