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Derivative Instruments - Statement Of Financial Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Derivative [Line Items]        
Derivative asset, net, gross fair value $ 2,839 $ 21,921    
Derivative assets, net, net fair value 2,839 21,921 $ (3,632) $ 14,959
Current derivative assets        
Derivative [Line Items]        
Derivative asset, gross fair value 9,419 19,690    
Derivative asset, amounts netted (3,338) (871)    
Derivative assets, net fair value 6,081 18,819    
Non-current derivative assets        
Derivative [Line Items]        
Derivative asset, gross fair value 0 4,651    
Derivative asset, amounts netted 0 (1,549)    
Derivative assets, net fair value 0 3,102    
Current derivative liabilities        
Derivative [Line Items]        
Derivative liability, gross fair value (3,610) (871)    
Derivative liability, amounts netted 3,338 871    
Derivative liability, net fair value (272) 0    
Non-current derivative liabilities        
Derivative [Line Items]        
Derivative liability, gross fair value (2,970) (1,549)    
Derivative liability, amounts netted 0 1,549    
Derivative liability, net fair value $ (2,970) $ 0