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Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments [Abstract]  
Investment The following table summarizes other investments at December 31:
NW HoldingsNW Natural
In thousands2021202020212020
Investments in life insurance policies$48,178 $49,241 $48,178 $49,242 
Investments in gas reserves, non-current26,608 34,484 26,608 34,484 
Investment in unconsolidated affiliates14,492 18 — — 
Total other investments$89,278 $83,743 $74,786 $83,726