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Debt Short-term Debt - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Short-term Debt [Line Items]      
Short-term debt $ 72,500 $ 258,200 $ 332,500
Northwest Natural Gas Company [Member]      
Short-term Debt [Line Items]      
Short-term debt 0 170,200 188,500
Line of Credit [Member]      
Short-term Debt [Line Items]      
Short-term debt $ 72,500 $ 88,000 $ 144,000
Debt, Weighted Average Interest Rate 5.90% 5.30% 1.50%
Commercial Paper [Member] | Northwest Natural Gas Company [Member]      
Short-term Debt [Line Items]      
Short-term debt $ 0 $ 170,200 $ 188,500
Debt, Weighted Average Interest Rate 0.00% 4.60% 0.80%