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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Long-term Purchase Commitment
The aggregate amounts of these agreements at NW Natural were as follows at December 31, 2021:
In thousands
Gas Purchase Agreements(1)
Pipeline
Capacity
Purchase Agreements		Pipeline
Capacity
Release Agreements
2022$168,296 $85,335 $7,596 
20236,376 87,449 4,036 
20246,426 80,923 4,036 
202512,076 78,449 3,363 
202612,133 63,608 — 
Thereafter203,500 507,666 — 
   Total408,807 903,430 19,031 
Less: Amount representing interest44,571 119,202 382 
Total at present value$364,236 $784,228 $18,649