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Investments
 3 Months Ended
Mar. 31, 2024
Investments [Abstract]  
Investment [Table Text Block]
Investments include gas reserves, financial investments in life insurance policies, and equity method investments. The following table summarizes other investments:

NW HoldingsNW Natural
March 31,December 31,March 31,December 31,
In thousands202420232023202420232023
Investments in life insurance policies$45,937 $47,666 $45,713 $45,937 $47,666 $45,713 
Investments in gas reserves, non-current20,406 22,229 20,893 20,406 22,229 20,893 
Investment in unconsolidated affiliates17,738 23,716 36,345 — 8,207 19,539 
Total other investments$84,081 $93,611 $102,951 $66,343 $78,102 $86,145