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Transactions with Major Customers and Affiliates (Tables)
 12 Months Ended
Dec. 31, 2022
Transactions with Major Customers and Affiliates [Abstract]  
Schedule of revenue by major customers
During the periods presented, more than 10 percent of our operating revenues were generated from each of the following customers:
 
Year Ended December 31,
202220212020
(Thousands)
Puget Sound Energy, Inc.$130,705 $131,462 $132,747 
Northwest Natural Gas Company48,921 48,901 48,893 
Cascade Natural Gas Corporation48,664 49,078 47,493