v3.24.2.u1
Investments
$ in Thousands
Jun. 30, 2024
USD ($)
numberOfConnections
employee
Jan. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jul. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]            
Life Insurance, Corporate or Bank Owned, Amount $ 46,295   $ 45,713 $ 46,772    
Gas reserves, noncurrent 19,570   20,893 21,488    
Equity Method Investment, Aggregate Cost 17,930   36,345 36,070    
Other investments 83,795   102,951 104,330    
Total cumulative gas reserves investment 188,000          
Deferred Taxes Related To Gas Reserves 3,000   4,000 4,400    
Gas reserves, current 2,500   2,300 3,200    
Northwest Natural Gas Company [Member]            
Schedule of Equity Method Investments [Line Items]            
Life Insurance, Corporate or Bank Owned, Amount 46,295   45,713 46,772    
Gas reserves, noncurrent 19,570   20,893 21,488    
Equity Method Investment, Aggregate Cost 0   19,539 19,588    
Other investments $ 65,865   $ 86,145 $ 87,848    
Other Northwest Holdings [Member] | Avion Water            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage of Avion   45.60%   43.10% 40.30% 37.30%
Investment balance in Avion           $ 14,500
Equity Method Investment, Number of Customer Connections | numberOfConnections 16,000          
Equity Method Investment, Number of Employees | employee 35          
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity $ 9,900          
Equity Method Investment, Additional Underlying Equity in Net Assets   $ 1,000   $ 1,000 $ 1,000