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DERIVATIVE INSTRUMENTS: (Details)
 3 Months Ended 5 Months Ended
Mar. 31, 2022
USD ($)
item
$ / item
Mar. 31, 2022
USD ($)
item
Derivatives designated as hedging instruments under ASC 815    
Number of derivative contracts entered | item 2  
Derivative instruments held | item 0 0
Call Option | Natural Gas | Derivatives designated as hedging instruments    
Derivatives designated as hedging instruments under ASC 815    
Gas volume (MMBTUs) 5,285,000 5,285,000
Hedge premium ($per MMBTU) | $ / item 0.55  
Cost (million $) $ (1,700,000) $ (2,900,000)
Profit (million $) 500,000 500,000
Net favorable/unfavorable effect (million $) $ (1,200,000) $ (2,400,000)
Derivative instruments held 500,000 500,000
Swap contracts | Natural Gas | Derivatives designated as hedging instruments    
Derivatives designated as hedging instruments under ASC 815    
Gas volume (MMBTUs) 5,285,000 5,285,000
Reference price (swap: $per MMBTU)) | $ / item 3.75  
Profit (million $) $ 1,700,000 $ 4,700,000
Net favorable/unfavorable effect (million $) $ 1,700,000 $ 4,700,000
Derivative instruments held 2,300,000 2,300,000