Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
EQUITY INVESTMENTS (Investments Accounted for by the Equity Method) (Details) - USD ($)
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
May 17, 2021
Sep. 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 $ (153,000) $ 0 (342,000) $ (10,987,000)    
Investment in Grizzly Oil Sands ULC              
Schedule of Equity Method Investments [Line Items]              
Carrying value       0   24,816,000  
Loss from equity method investments   (153,000)   (342,000) (341,000)    
Investment in Mammoth Energy              
Schedule of Equity Method Investments [Line Items]              
Carrying value           $ 0 $ 0
Loss from equity method investments   $ 0   $ 0 $ (10,646,000)