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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Long-term Purchase Commitment
The aggregate amounts of these agreements at NW Natural were as follows at December 31, 2022:
In thousands
Gas Purchase Agreements(1)
Pipeline
Capacity
Purchase Agreements		Pipeline
Capacity
Release Agreements
2023$400,370 $81,691 $8,154 
20246,376 77,327 7,474 
20256,426 78,493 3,397 
202612,003 66,782 — 
202711,330 66,906 — 
Thereafter189,050 432,464 — 
   Total625,555 803,663 19,025 
Less: Amount representing interest86,250 200,243 989 
Total at present value$539,305 $603,420 $18,036