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REVENUES: Revenues Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]      
Revenue from contracts with customers $ 1,639,612 $ 1,557,974 $ 1,382,653
Regulatory Assets 1,653,050 1,501,961  
Regulatory Liabilities $ 882,553 $ 860,601