v3.26.1
Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax at statutory rate (federal) $ 254 $ (722) $ 27,560 $ 24,991
State income tax 101 (210) 8,931 9,770
Differences required to be flowed-through by regulatory commissions 6 8 (1,948) (1,660)
Other, net 249 (16) (1,394) 486
Total expense (benefit) for income taxes $ 610 $ (940) $ 33,149 $ 33,587
Effective income tax rate 50.50% 27.30% 25.30% 28.20%
Tax Jurisdiction of Domicile [Extensible Enumeration] UNITED STATES UNITED STATES UNITED STATES UNITED STATES
NW Natural        
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax at statutory rate (federal) $ 1,294 $ 1,378 $ 27,734 $ 27,986
State income tax 649 306 9,896 10,508
Differences required to be flowed-through by regulatory commissions 7 9 (1,947) (1,659)
Other, net 281 (55) (1,297) 467
Total expense (benefit) for income taxes $ 2,231 $ 1,638 $ 34,386 $ 37,302
Effective income tax rate 36.20% 25.00% 26.00% 28.00%