Annual report pursuant to Section 13 and 15(d)

EQUITY INVESTMENTS - Narrative (Details)

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EQUITY INVESTMENTS - Narrative (Details)
a in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
a
Dec. 31, 2019
USD ($)
May 17, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]          
Equity investments $ 0   $ 0 $ 24,816,000  
Investment in Grizzly Oil Sands ULC | Athabasca Peace River And Cold Lake Oil Sands Regions          
Schedule of Equity Method Investments [Line Items]          
Gas and oil area, reserve (acres) | a 830        
Investment in Grizzly Oil Sands ULC          
Schedule of Equity Method Investments [Line Items]          
Equity investment, ownership interest 24.50%        
Amount of cash paid for equity investments   $ 0      
Equity investments     $ 0 $ 24,816,000  
Mammoth Energy Partners LP          
Schedule of Equity Method Investments [Line Items]          
Equity investment, ownership interest       21.50%  
Equity investments       $ 0 $ 0