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 ($)
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
Jun. 30, 2021
May 17, 2021
Jun. 30, 2020
May 17, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]              
Carrying value $ 0 $ 0   $ 0   $ 24,816,000  
Loss from equity method investments $ 0 0 $ (45,000) (342,000) $ (10,834,000)    
Investment in Grizzly Oil Sands ULC              
Schedule of Equity Method Investments [Line Items]              
Equity investment, ownership interest 24.50%            
Carrying value $ 0 0   0   24,816,000  
Loss from equity method investments $ 0 0 (45,000) (342,000) (188,000)    
Investment in Mammoth Energy              
Schedule of Equity Method Investments [Line Items]              
Equity investment, ownership interest 0.00%            
Carrying value $ 0         $ 0 $ 0
Loss from equity method investments $ 0 $ 0 $ 0 $ 0 $ (10,646,000)