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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
May 01, 2018
Schedule of Equity Method Investments [Line Items]        
Equity investments and investments in subsidiaries $ 244,119   $ 236,121  
Income from equity method investments, net $ (4,273) $ (13,536)    
Investment in Tatex Thailand II, LLC        
Schedule of Equity Method Investments [Line Items]        
Approximate ownership % 23.50%      
Equity investments and investments in subsidiaries $ 0   0  
Income from equity method investments, net $ (140) (41)    
Investment in Grizzly Oil Sands ULC        
Schedule of Equity Method Investments [Line Items]        
Approximate ownership % 24.9999%      
Equity investments and investments in subsidiaries $ 48,004   44,259  
Income from equity method investments, net $ 393 330    
Investment in Timber Wolf Terminals LLC(1)        
Schedule of Equity Method Investments [Line Items]        
Approximate ownership % 0.00%      
Equity investments and investments in subsidiaries $ 0   0  
Income from equity method investments, net $ 0 2    
Investment in Windsor Midstream LLC        
Schedule of Equity Method Investments [Line Items]        
Approximate ownership % 22.50%      
Equity investments and investments in subsidiaries $ 39   39  
Income from equity method investments, net 0 0    
Investment in Mammoth Energy Services, Inc.        
Schedule of Equity Method Investments [Line Items]        
Equity investments and investments in subsidiaries 196,076   191,823  
Income from equity method investments, net $ (4,526) (13,470)    
Investment in Strike Force Midstream LLC        
Schedule of Equity Method Investments [Line Items]        
Approximate ownership % 0.00%     25.00%
Equity investments and investments in subsidiaries $ 0   $ 0  
Income from equity method investments, net $ 0 $ (357)