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Regulatory Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule of Regulatory Assets and Liabilities [Table Text Block]
Our regulatory assets and liabilities result from our application of the provisions of Topic 980 and are reflected on our Balance Sheet. Current regulatory assets are included in Prepayments and other. Current regulatory liabilities are included in Exchange gas due to others. These balances are presented on our Balance Sheet on a gross basis and are recoverable or refundable over various periods. Below are the details of our regulatory assets and liabilities as of December 31, 2021 and 2020:
20212020
(Thousands)
Current regulatory assets:
Levelized depreciation$1,251 $1,360 
Fuel recovery107 52 
Total current regulatory assets1,358 1,412 
Non-current regulatory assets:
Grossed-up deferred taxes on equity funds used during construction4,731 5,114 
Levelized depreciation13,581 14,908 
Total non-current regulatory assets18,312 20,022 
Total regulatory assets$1,358 $21,434 
Current regulatory liabilities:
Fuel recovery$32 $3,232 
Non-current regulatory liabilities:
Postretirement benefits40,980 39,391 
Deferred federal taxes - liability206,527 206,527 
Deferred state taxes - liability12,120 12,120 
Customer tax refund102,059 75,694 
Asset retirement obligations, net26,747 21,993 
Total non-current regulatory liabilities388,433 355,725 
Total regulatory liabilities$388,465 $358,957