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Income Tax (Tables)
 3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The effective income tax rate varied from the federal statutory rate due to the following:
 
 
Three Months Ended March 31,
 
 
NW Holdings
 
NW Natural
In thousands
 
2020
 
2019
 
2020
 
2019
Income tax at statutory rate (federal)
 
$
13,105

 
$
11,022

 
$
13,355

 
$
11,159

State
 
3,677

 
3,291

 
3,737

 
3,326

Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
(2,525
)
 
(5,260
)
 
(2,525
)
 
(5,260
)
Other, net
 
(130
)
 
(378
)
 
(149
)
 
(377
)
Total provision for income taxes on continuing operations
 
$
14,127

 
$
8,675

 
$
14,418

 
$
8,848

Effective income tax rate for continuing operations
 
22.8
%
 
16.7
%
 
22.8
%
 
16.8
%