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Investments (Tables)
 12 Months Ended
Dec. 31, 2023
Investments [Abstract]  
Investment The following table summarizes other investments at December 31:
NW HoldingsNW Natural
In thousands2023202220232022
Investments in life insurance policies$45,713 $49,358 $45,713 $49,358 
Investments in gas reserves, non-current20,893 22,970 20,893 22,970 
Investments in unconsolidated affiliates36,345 23,376 19,539 7,782 
Total other investments$102,951 $95,704 $86,145 $80,110