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Leases - Lease Revenue - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
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 $ 4,800 $ 4,400 $ 4,700
Lease Revenue [Abstract]      
Total lease revenue 100 100  
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 471    
Lessor, Operating Lease, Payment to be Received, Year One 125    
Operating Lease, Payments to be Received, Two Years 126    
Operating Lease, Payments to be Received, Three Years 119    
Operating Lease, Payments to be Received, Four Years 92    
Operating Lease, Payments to be Received, Thereafter 936    
Total minimum lease payments 1,869    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 13,199    
Lease Payments to be Received, Two Years 16,682    
Lease Payments to be Received, Three Years 15,993    
Lease Payments to be Received, Four Years 15,425    
Lease Payments to be Received, Five Years 14,993    
Lease Payments to be Received, Thereafter 237,756    
Total minimum lease payments 314,048    
Northwest Natural Gas Company [Member]      
Lease Revenue [Abstract]      
Operating leases 18 18  
Sales-type leases 4,281 4,369  
Total lease revenue 4,299 $ 4,387  
Operating Leases Payment to be Received [Abstract]      
Operating Lease, Payments to be Received, Remainder of Fiscal Year 433    
Lessor, Operating Lease, Payment to be Received, Year One 74    
Operating Lease, Payments to be Received, Two Years 74    
Operating Lease, Payments to be Received, Three Years 66    
Operating Lease, Payments to be Received, Four Years 36    
Operating Lease, Payments to be Received, Thereafter 22    
Total minimum lease payments 705    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 13,161    
Lease Payments to be Received, Two Years 16,631    
Lease Payments to be Received, Three Years 15,941    
Lease Payments to be Received, Four Years 15,372    
Lease Payments to be Received, Five Years 14,937    
Lease Payments to be Received, Thereafter 236,842    
Total minimum lease payments 312,884    
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 51    
Operating Lease, Payments to be Received, Two Years 52    
Operating Lease, Payments to be Received, Three Years 53    
Operating Lease, Payments to be Received, Four Years 56    
Operating Lease, Payments to be Received, Thereafter 914    
Total minimum lease payments 1,164    
Total Lease Payments to be Received [Abstract]      
Lease Payments to be Received, Remainder of Fiscal Year 38    
Lease Payments to be Received, Two Years 51    
Lease Payments to be Received, Three Years 52    
Lease Payments to be Received, Four Years 53    
Lease Payments to be Received, Five Years 56    
Lease Payments to be Received, Thereafter 914    
Total minimum lease payments $ 1,164    
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 12,728    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 16,557    
Sales-type Lease, Payments to be Received, Two Years 15,867    
Sales-type Lease, Payments to be Received, Three Years 15,306    
Sales-type Lease, Payments to be Received, Four Years 14,901    
Sales-type Lease, Payments to be Received, Thereafter 236,820    
Total minimum lease payments 312,179    
Less: imputed interest 174,122    
Total leases receivable 138,057    
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 12,728    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 16,557    
Sales-type Lease, Payments to be Received, Two Years 15,867    
Sales-type Lease, Payments to be Received, Three Years 15,306    
Sales-type Lease, Payments to be Received, Four Years 14,901    
Sales-type Lease, Payments to be Received, Thereafter 236,820    
Total minimum lease payments 312,179    
Less: imputed interest 174,122    
Total leases receivable 138,057    
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