Quarterly report pursuant to Section 13 or 15(d)

EQUITY INVESMENTS (Narrative) (Details)

v3.19.2
EQUITY INVESMENTS (Narrative) (Details)
$ / shares in Units, a in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
a
$ / shares
shares
Jun. 30, 2018
USD ($)
May 31, 2018
May 01, 2018
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 125,582,000 $ (8,888,000) $ 121,309,000 $ (22,424,000)    
Distributions from equity method investments     1,945,000 1,196,000    
Mammoth Energy Services LP            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, impairment     125,400,000      
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 $ 67,700,000   $ 67,700,000      
Tatex Thailand II, LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ (1,945,000) (63,000) $ (2,085,000) (104,000)    
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 $ (54,000) 228,000 $ 339,000 558,000    
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 $ 3,500,000 (3,400,000) $ 7,300,000 (8,700,000)    
Equity method investment, ownership interest, percent 24.9999%   24.9999%      
Windsor Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 0 (9,000) $ 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) 200,000 (300,000)    
Strike Force Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Loss (income) from equity method investments, net $ 0 $ (336,000) $ 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%