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Regulatory Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
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 ASC 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, 2020 and 2019:
20202019
(Thousands)
Current regulatory assets:
Levelized depreciation$1,360 $978 
Fuel Recovery52 — 
Total current regulatory assets1,412 978 
Non-current regulatory assets:
Grossed-up deferred taxes on equity funds used during construction5,114 5,498 
Levelized depreciation14,908 16,437 
Total non-current regulatory assets20,022 21,935 
Total regulatory assets$21,434 $22,913 
Current regulatory liabilities:
Fuel recovery$3,232 $4,121 
Non-current regulatory liabilities:
Postretirement benefits39,391 37,722 
Deferred federal taxes-liability206,527 206,527 
Deferred state taxes - liability12,120 12,120 
Customer tax refund75,694 49,598 
Asset retirement obligations, net21,993 17,065 
Total non-current regulatory liabilities355,725 323,032 
Total regulatory liabilities$358,957 $327,153