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Leases - Lease Revenue - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Lessor, Lease, Description [Line Items]      
Lessor, Sales-type Lease, Renewal Term 50 years    
Lessor, Sales-type Lease, Term of Contract 30 years    
Residual Value of Leased Asset $ 5,200 $ 4,800 $ 5,100
Lease Revenue [Abstract]      
Total lease revenue 200 100  
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 504    
Lessor, Operating Lease, Payment to be Received, Year One 665    
Operating Lease, Payments to be Received, Two Years 657    
Operating Lease, Payments to be Received, Three Years 92    
Operating Lease, Payments to be Received, Four Years 79    
Operating Lease, Payments to be Received, Thereafter 857    
Total minimum lease payments 2,854    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 12,880    
Lease Payments to be Received, Two Years 16,532    
Lease Payments to be Received, Three Years 15,963    
Lease Payments to be Received, Four Years 14,993    
Lease Payments to be Received, Five Years 14,600    
Lease Payments to be Received, Thereafter 223,156    
Total minimum lease payments 298,124    
Northwest Natural Gas Company [Member]      
Lease Revenue [Abstract]      
Operating leases 19 18  
Sales-type leases 3,979 4,281  
Total lease revenue 3,998 $ 4,299  
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 466    
Lessor, Operating Lease, Payment to be Received, Year One 613    
Operating Lease, Payments to be Received, Two Years 604    
Operating Lease, Payments to be Received, Three Years 36    
Operating Lease, Payments to be Received, Four Years 22    
Operating Lease, Payments to be Received, Thereafter 0    
Total minimum lease payments 1,741    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 12,842    
Lease Payments to be Received, Two Years 16,480    
Lease Payments to be Received, Three Years 15,910    
Lease Payments to be Received, Four Years 14,937    
Lease Payments to be Received, Five Years 14,543    
Lease Payments to be Received, Thereafter 222,299    
Total minimum lease payments 297,011    
Other Northwest Holdings [Member]      
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 38    
Lessor, Operating Lease, Payment to be Received, Year One 52    
Operating Lease, Payments to be Received, Two Years 53    
Operating Lease, Payments to be Received, Three Years 56    
Operating Lease, Payments to be Received, Four Years 57    
Operating Lease, Payments to be Received, Thereafter 857    
Total minimum lease payments 1,113    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 38    
Lease Payments to be Received, Two Years 52    
Lease Payments to be Received, Three Years 53    
Lease Payments to be Received, Four Years 56    
Lease Payments to be Received, Five Years 57    
Lease Payments to be Received, Thereafter 857    
Total minimum lease payments $ 1,113    
Compressed Natural Gas Lease [Member]      
Lessor, Lease, Description [Line Items]      
Lessor, Sales-type Lease, Term of Contract 10 years    
Residual Value of Leased Asset $ 0    
Variable Lease, Payment 0    
North Mist Lease [Member]      
Lessor, Lease, Description [Line Items]      
Residual Value of Leased Asset 0    
Variable Lease, Payment 0    
Sales-type Lease [Member]      
Sales-type Leases Payments to be Received [Abstract]      
Sales-type Lease, Payments to be Received, Remainder of Fiscal Year 12,376    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 15,867    
Sales-type Lease, Payments to be Received, Two Years 15,306    
Sales-type Lease, Payments to be Received, Three Years 14,901    
Sales-type Lease, Payments to be Received, Four Years 14,521    
Sales-type Lease, Payments to be Received, Thereafter 222,299    
Total minimum lease payments 295,270    
Less: imputed interest 162,326    
Total leases receivable 132,944    
Sales-type Lease [Member] | Northwest Natural Gas Company [Member]      
Sales-type Leases Payments to be Received [Abstract]      
Sales-type Lease, Payments to be Received, Remainder of Fiscal Year 12,376    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 15,867    
Sales-type Lease, Payments to be Received, Two Years 15,306    
Sales-type Lease, Payments to be Received, Three Years 14,901    
Sales-type Lease, Payments to be Received, Four Years 14,521    
Sales-type Lease, Payments to be Received, Thereafter 222,299    
Total minimum lease payments 295,270    
Less: imputed interest 162,326    
Total leases receivable 132,944    
Sales-type Lease [Member] | Other Northwest Holdings [Member]      
Sales-type Leases Payments to be Received [Abstract]      
Sales-type Lease, Payments to be Received, Remainder of Fiscal Year 0    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 0    
Sales-type Lease, Payments to be Received, Two Years 0    
Sales-type Lease, Payments to be Received, Three Years 0    
Sales-type Lease, Payments to be Received, Four Years 0    
Sales-type Lease, Payments to be Received, Thereafter 0    
Total minimum lease payments $ 0