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Risk Management and Derivatives: Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Interest Rate Swap and Commodity Derivative        
Derivative [Line Items]        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     $ 6,100  
Designated as Hedging Instrument        
Derivative [Line Items]        
Unrealized Gain (Loss) on Cash Flow Hedging Instruments $ (3,658) $ 1,900 (3,812) $ 2,786
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 610 (657) 2,151 (1,401)
Designated as Hedging Instrument | Interest rate swaps        
Derivative [Line Items]        
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 713 713 1,426 1,426
Designated as Hedging Instrument | Interest rate swaps | Interest Expense        
Derivative [Line Items]        
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 713 713 1,426 1,426
Designated as Hedging Instrument | Commodity Contract        
Derivative [Line Items]        
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (4,371) 1,187 (5,238) 1,360
Designated as Hedging Instrument | Commodity Contract | Fuel, purchased power and cost of natural gas sold        
Derivative [Line Items]        
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion $ 1,323 $ 56 $ 3,577 $ 25