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 ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]            
Equity investments and investments in subsidiaries $ 16,560,000   $ 16,560,000     $ 32,044,000
Loss from equity method investments, net $ (153,000) $ (43,082,000) $ (10,987,000) $ (164,391,000)    
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 $ 16,521,000   $ 16,521,000     21,000,000
Loss from equity method investments, net $ (153,000) (41,000) $ (341,000) (380,000)    
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   $ 0 11,005,000
Loss from equity method investments, net $ 0 (43,041,000) $ (10,646,000) (166,096,000)    
Investment in Windsor Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Approximate ownership % 22.50%   22.50%      
Equity investments and investments in subsidiaries $ 39,000   $ 39,000     39,000
Loss from equity method investments, net $ 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 $ 0 $ 0 $ 2,085,000