Quarterly report pursuant to Section 13 or 15(d)

EQUITY INVESMENTS (Investments Accounted for by the Equity Method) (Details)

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EQUITY INVESMENTS (Investments Accounted for by the Equity Method) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
May 01, 2018
Schedule of Equity Method Investments [Line Items]            
Equity investments and investments in subsidiaries $ 73,962   $ 73,962   $ 236,121  
Loss (income) from equity method investments, net $ 43,082 $ (12,858) $ 164,391 $ (35,282)    
Investment in Tatex Thailand II, LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 23.50%   23.50%      
Equity investments and investments in subsidiaries $ 0   $ 0   0  
Loss (income) from equity method investments, net $ 0 (137) $ (2,085) (241)    
Investment in Grizzly Oil Sands ULC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 24.9999%   24.9999%      
Equity investments and investments in subsidiaries $ 49,546   $ 49,546   44,259  
Loss (income) from equity method investments, net $ 41 275 $ 380 833    
Investment in Timber Wolf Terminals LLC(1)            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 0.00%   0.00%      
Equity investments and investments in subsidiaries $ 0   $ 0   0  
Loss (income) from equity method investments, net $ 0 0 $ 0 536    
Investment in Windsor Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 22.50%   22.50%      
Equity investments and investments in subsidiaries $ 39   $ 39   39  
Loss (income) from equity method investments, net 0 0 0 (9)    
Investment in Mammoth Energy Services, Inc.            
Schedule of Equity Method Investments [Line Items]            
Equity investments and investments in subsidiaries 24,377   24,377   191,823  
Loss (income) from equity method investments, net $ 43,041 (12,996) $ 166,096 (35,708)    
Investment in Strike Force Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 0.00%   0.00%     25.00%
Equity investments and investments in subsidiaries $ 0   $ 0   $ 0  
Loss (income) from equity method investments, net $ 0 $ 0 $ 0 $ (693)