Quarterly report pursuant to Section 13 or 15(d)

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

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EQUITY INVESTMENTS (Investments Accounted for by the Equity Method) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Equity investments and investments in subsidiaries $ 13,052   $ 13,052   $ 32,044
Loss from equity method investments, net $ (45) $ (125,582) $ (10,834) $ (121,309)  
Investment in Grizzly Oil Sands ULC          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 24.60%   24.60%    
Equity investments and investments in subsidiaries $ 13,013   $ 13,013   21,000
Loss from equity method investments, net $ (45) 54 $ (188) (339)  
Investment in Mammoth Energy Services, Inc.          
Schedule of Equity Method Investments [Line Items]          
Approximate ownership % 21.50%   21.50%    
Equity investments and investments in subsidiaries $ 0   $ 0   11,005
Loss from equity method investments, net $ 0 (127,581) $ (10,646) (123,055)  
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 from equity method investments, net $ 0 0 $ 0 0  
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 from equity method investments, net $ 0 $ 1,945 $ 0 $ 2,085