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
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Equity investments and investments in subsidiaries $ 6,225,000   $ 32,044,000
Loss (income) from equity method investments, net $ 10,789,000 $ (4,273,000)  
Investment in Grizzly Oil Sands ULC      
Schedule of Equity Method Investments [Line Items]      
Approximate ownership % 24.90%    
Equity investments and investments in subsidiaries $ 6,186,000   21,000,000
Loss (income) from equity method investments, net $ 143,000 393,000  
Investment in Mammoth Energy Services, Inc.      
Schedule of Equity Method Investments [Line Items]      
Approximate ownership % 21.50%    
Equity investments and investments in subsidiaries $ 0   11,005,000
Loss (income) from equity method investments, net $ 10,646,000 (4,526,000)  
Investment in Windsor Midstream LLC      
Schedule of Equity Method Investments [Line Items]      
Approximate ownership % 22.50%    
Equity investments and investments in subsidiaries $ 39,000   39,000
Loss (income) from equity method investments, net $ 0 0  
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
Loss (income) from equity method investments, net $ 0 $ (140,000)