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Derivative Accounting - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative Accounting            
Derivative liability $ 70,986,000 $ 70,986,000   $ 70,986,000   $ 72,132,000
Commodity Contracts            
Derivative Accounting            
Derivative liability 70,986,000 70,986,000   70,986,000   $ 72,132,000
Additional collateral to counterparties for energy related non-derivative instrument contracts 88,000,000 88,000,000   88,000,000    
Aggregate fair value of derivative instruments in a net liability position $ 72,590,000 72,590,000   72,590,000    
Commodity Contracts | Designated as Hedging Instruments            
Derivative Accounting            
Amount reclassified from accumulated other comprehensive income to earnings related to discontinued cash flow hedges   $ 0 $ 0 $ 0 $ 0  
APS            
Derivative Accounting            
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment 100.00% 100.00%   100.00%    
Risk Management Assets | Credit Concentration Risk            
Derivative Accounting            
Concentration risk 79.00%          
Aggregate fair value of derivative instruments in a net liability position $ 700,000 $ 700,000   $ 700,000