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Regulatory Matters: Winter Storm Uri (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]          
Regulatory assets $ 702,368   $ 702,368   $ 796,599
Winter Storm Uri Incremental Costs in a Separately Tracked Mechanism          
Public Utilities, General Disclosures [Line Items]          
Regulatory assets 402,971   402,971   509,025
Winter Storm Uri          
Public Utilities, General Disclosures [Line Items]          
Amount Recovered Through Regulatory Mechanism     $ 111,000    
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     3 years   3 years 6 months
Winter Storm Uri | Winter Storm Uri          
Public Utilities, General Disclosures [Line Items]          
Storm Carrying Costs 12,000 $ 100 $ 15,000 $ 100  
Storm Carrying Costs One Time True-up to Commission Authorized Rates $ 10,000   $ 10,000