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Regulatory Matters: Winter Storm Uri (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]            
Regulatory assets $ 706,206     $ 706,206   $ 796,599
Winter Storm Uri Incremental Costs in a Separately Tracked Mechanism            
Public Utilities, General Disclosures [Line Items]            
Regulatory assets 392,994     392,994   509,025
Winter Storm Uri            
Public Utilities, General Disclosures [Line Items]            
Amount Recovered Through Regulatory Mechanism       $ 125,000    
Winter Storm Uri | Winter Storm Uri Incremental Costs in a Separately Tracked Mechanism            
Public Utilities, General Disclosures [Line Items]            
Regulatory assets           $ 546,000
Regulatory Asset, Amortization Period       2 years 9 months 18 days   3 years 6 months
Winter Storm Uri | Winter Storm Uri            
Public Utilities, General Disclosures [Line Items]            
Storm Carrying Costs $ 3,700   $ 1,800 $ 18,000 $ 1,800  
Storm Carrying Costs One Time True-up to Commission Authorized Rates   $ 10,000