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Derivative Accounting - Narrative (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Commodity Contracts  
Derivative Accounting  
Aggregate fair value of derivative instruments in a net liability position $ 3,563
Additional collateral to counterparties for energy related non-derivative instrument contracts 76,000
Risk Management Assets | Credit Concentration Risk  
Derivative Accounting  
Aggregate fair value of derivative instruments in a net liability position $ 252,000
Risk Management Assets | Credit Concentration Risk | One Counterparties  
Derivative Accounting  
Concentration risk 18.00%
APS  
Derivative Accounting  
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment 100.00%