v3.24.2.u1
Income Tax - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income taxes at statutory rates (federal and state) $ (756) $ 312 $ 17,758 $ 20,644
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount (345) 211 7,232 8,360
Differences required to be flowed-through by regulatory commissions 107 (161) (1,472) (3,070)
Other, net 182 (119) 9 (544)
Total provision for income taxes on continuing operations $ (812) $ 243 $ 23,527 $ 25,390
Effective tax rate for continuing operations 22.60% 16.30% 27.80% 25.80%
Northwest Natural Gas Company [Member]        
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income taxes at statutory rates (federal and state) $ (80) $ 442 $ 19,499 $ 21,854
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount (167) 217 7,682 8,623
Differences required to be flowed-through by regulatory commissions 108 (160) (1,472) (3,069)
Other, net 183 (177) 8 (664)
Total provision for income taxes on continuing operations $ 44 $ 322 $ 25,717 $ 26,744
Effective tax rate for continuing operations (11.60%) 15.30% 27.70% 25.70%