Quarterly report pursuant to Section 13 or 15(d)

EQUITY INVESMENTS (Narrative) (Details)

v3.19.1
EQUITY INVESMENTS (Narrative) (Details)
$ / shares in Units, a in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
a
$ / shares
shares
Mar. 31, 2018
USD ($)
May 31, 2018
May 01, 2018
Schedule of Equity Method Investments [Line Items]        
Income from equity method investments, net $ (4,273,000) $ (13,536,000)    
Distributions from equity method investments 0 750,000    
Mammoth Energy Services LP        
Schedule of Equity Method Investments [Line Items]        
Distributions from equity method investments $ 1,200,000      
Equity method investment, ownership interest (in shares) | shares 9,831,770      
Approximate fair value, quoted market price $ 163,700,000      
Share dividend (in usd per share) | $ / shares $ 0.125      
Tatex Thailand II, LLC        
Schedule of Equity Method Investments [Line Items]        
Income from equity method investments, net $ (140,000) (41,000)    
Equity method investment, ownership interest, percent 23.50%      
Grizzly Oil Sands ULC        
Schedule of Equity Method Investments [Line Items]        
Gas and oil area, reserve (in acres) | a 830      
Equity method investment, impairment $ 0 0    
Income from equity method investments, net $ 393,000 330,000    
Equity method investment, ownership interest, percent 24.9999%      
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 3,700,000 (5,300,000)    
Windsor Midstream LLC        
Schedule of Equity Method Investments [Line Items]        
Income from equity method investments, net $ 0 0    
Equity method investment, ownership interest, percent 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 (200,000)    
Strike Force Midstream LLC        
Schedule of Equity Method Investments [Line Items]        
Income from equity method investments, net $ 0 (357,000)    
Equity method investment, ownership interest, percent 0.00%     25.00%
Distributions from equity method investments   $ 800,000    
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%      
Investee | Mammoth Energy Services LP        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest, percent 21.90%      
Investee | Strike Force Midstream LLC        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest, percent     25.00%