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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 01, 2018
Dec. 31, 2017
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]              
Equity investments and investments in subsidiaries $ 232,529   $ 232,529     $ 302,112  
(Income) loss from equity method investments, net $ (12,858) $ 2,737 $ (35,282) $ 33,468      
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  
(Income) loss from equity method investments, net $ (137) (95) $ (241) (549)      
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 $ 53,381   $ 53,381     57,641  
(Income) loss from equity method investments, net $ 275 296 $ 833 869      
Investment in Timber Wolf Terminals LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 50.00%   50.00%        
Equity investments and investments in subsidiaries $ 0   $ 0     983  
(Income) loss from equity method investments, net $ 0 4 $ 536 8      
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     30  
(Income) loss from equity method investments, net $ 0 (2) $ (9) 25,232      
Investment in Stingray Cementing LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 0.00%   0.00%        
Equity investments and investments in subsidiaries $ 0   $ 0     0  
(Income) loss from equity method investments, net $ 0 0 $ 0 205      
Investment in Stingray Energy Services LLC              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 0.00%   0.00%        
Equity investments and investments in subsidiaries $ 0   $ 0     0  
(Income) loss from equity method investments, net $ 0 0 $ 0 282      
Investment in Sturgeon Acquisitions 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  
(Income) loss from equity method investments, net $ 0 0 $ 0 (71)      
Investment in Mammoth Energy Services, Inc.              
Schedule of Equity Method Investments [Line Items]              
Approximate ownership % 22.00%   22.00%        
Equity investments and investments in subsidiaries $ 179,109   $ 179,109     165,715  
(Income) loss from equity method investments, net $ (12,996) 2,407 $ (35,708) 4,907      
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     $ 77,743  
(Income) loss from equity method investments, net $ 0 $ 127 $ (693) $ 2,585