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Investments (Tables)
 12 Months Ended
Dec. 31, 2022
Investments [Abstract]  
Investment The following table summarizes other investments at December 31:
NW HoldingsNW Natural
In thousands2022202120222021
Investments in life insurance policies$49,358 $48,178 $49,358 $48,178 
Investments in gas reserves, non-current22,970 26,608 22,970 26,608 
Investments in unconsolidated affiliates23,376 14,492 7,782 — 
Total other investments$95,704 $89,278 $80,110 $74,786