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Leases - Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]      
Short-term Lease, Cost $ 880 $ 1,220 $ 1,010
Lessor, Operating Lease, Payments to be Received, Two Years $ 664    
Operating Lease, Weighted Average Remaining Lease Term 17 years 2 months 12 days 18 years 2 months 12 days  
Lessee, Operating Lease, Liability, Payments, Due $ 146,271    
Regulatory Assets, Noncurrent 340,432 $ 314,579  
Operating Lease, Expense $ 7,034 6,917 4,506
New Headquarters Lease [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 20 years    
Lessee, Operating Lease, Term of Contract 20 years    
New Headquarters Lease [Member]      
Lessee, Lease, Description [Line Items]      
Regulatory Assets, Noncurrent $ 6,900 5,700  
New Headquarters Lease [Member] | New Headquarters Lease Renewal Term 1 of 2 [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 7 years    
Lessee, Operating Lease, Term of Contract 7 years    
New Headquarters Lease [Member] | New Headquarters Lease 1st Renewal Period [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 7 years    
Lessee, Operating Lease, Term of Contract 7 years    
Short Term Leases      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 12 months    
Lessee, Operating Lease, Term of Contract 12 months    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 9 months    
Lessee, Operating Lease, Term of Contract 9 months    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 17 years    
Lessee, Operating Lease, Term of Contract 17 years    
Northwest Natural Gas Company [Member]      
Lessee, Lease, Description [Line Items]      
Short-term Lease, Cost $ 880 $ 1,220 1,010
Lessor, Operating Lease, Payments to be Received, Two Years $ 612    
Operating Lease, Weighted Average Discount Rate, Percent 7.30% 7.20%  
Lessee, Operating Lease, Liability, Payments, Due $ 145,437    
Regulatory Assets, Noncurrent 340,407 $ 314,539  
Operating Lease, Expense 7,003 6,859 4,381
Northwest Holdings Other [Member] | Corporate, Non-Segment [Member]      
Lessee, Lease, Description [Line Items]      
Short-term Lease, Cost 0 0 0
Lessee, Operating Lease, Liability, Payments, Due 834    
Operating Lease, Expense $ 31 $ 58 $ 125