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Leases - Lease Revenue - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
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 $ 5,600 $ 5,200 $ 5,500
Lease Revenue [Abstract]      
Total lease revenue 100 200  
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 491    
Lessor, Operating Lease, Payment to be Received, Year One 652    
Operating Lease, Payments to be Received, Two Years 92    
Operating Lease, Payments to be Received, Three Years 79    
Operating Lease, Payments to be Received, Four Years 58    
Operating Lease, Payments to be Received, Thereafter 800    
Total minimum lease payments 2,172    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 12,391    
Lease Payments to be Received, Two Years 15,958    
Lease Payments to be Received, Three Years 14,993    
Lease Payments to be Received, Four Years 14,600    
Lease Payments to be Received, Five Years 14,041    
Lease Payments to be Received, Thereafter 209,018    
Total minimum lease payments 281,001    
Northwest Natural Gas Company [Member]      
Lease Revenue [Abstract]      
Operating leases 22 19  
Sales-type leases 4,104 3,979  
Total lease revenue 4,126 $ 3,998  
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 452    
Lessor, Operating Lease, Payment to be Received, Year One 599    
Operating Lease, Payments to be Received, Two Years 36    
Operating Lease, Payments to be Received, Three Years 22    
Operating Lease, Payments to be Received, Four Years 0    
Operating Lease, Payments to be Received, Thereafter 0    
Total minimum lease payments 1,109    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 12,352    
Lease Payments to be Received, Two Years 15,905    
Lease Payments to be Received, Three Years 14,937    
Lease Payments to be Received, Four Years 14,543    
Lease Payments to be Received, Five Years 13,983    
Lease Payments to be Received, Thereafter 208,218    
Total minimum lease payments 279,938    
Other Northwest Holdings [Member]      
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 39    
Lessor, Operating Lease, Payment to be Received, Year One 53    
Operating Lease, Payments to be Received, Two Years 56    
Operating Lease, Payments to be Received, Three Years 57    
Operating Lease, Payments to be Received, Four Years 58    
Operating Lease, Payments to be Received, Thereafter 800    
Total minimum lease payments 1,063    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 39    
Lease Payments to be Received, Two Years 53    
Lease Payments to be Received, Three Years 56    
Lease Payments to be Received, Four Years 57    
Lease Payments to be Received, Five Years 58    
Lease Payments to be Received, Thereafter 800    
Total minimum lease payments $ 1,063    
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 11,900    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 15,306    
Sales-type Lease, Payments to be Received, Two Years 14,901    
Sales-type Lease, Payments to be Received, Three Years 14,521    
Sales-type Lease, Payments to be Received, Four Years 13,983    
Sales-type Lease, Payments to be Received, Thereafter 208,218    
Total minimum lease payments 278,829    
Less: imputed interest 151,120    
Total leases receivable 127,709    
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 11,900    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 15,306    
Sales-type Lease, Payments to be Received, Two Years 14,901    
Sales-type Lease, Payments to be Received, Three Years 14,521    
Sales-type Lease, Payments to be Received, Four Years 13,983    
Sales-type Lease, Payments to be Received, Thereafter 208,218    
Total minimum lease payments 278,829    
Less: imputed interest 151,120    
Total leases receivable 127,709    
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