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Income Tax (Tables)
 9 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The effective income tax rate varied from the combined federal and state statutory tax rates due to the following:
 
 
Three Months Ended September 30,
 
 
NW Holdings
 
NW Natural
In thousands
 
2019
 
2018
 
2019

2018
Income taxes at statutory rates (federal and state)
 
$
(6,507
)
 
$
(4,136
)
 
$
(6,177
)
 
$
(4,183
)
Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
2,090

 
(266
)
 
2,090

 
(266
)
Other, net
 
74

 
117

 
74

 
116

Total provision for income taxes on continuing operations
 
$
(4,343
)
 
$
(4,285
)
 
$
(4,013
)
 
$
(4,333
)
Effective tax rate for continuing operations
 
19.0
%
 
27.8
%
 
18.6
%
 
27.8
%
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
 
NW Holdings
 
NW Natural
In thousands
 
2019
 
2018
 
2019
 
2018
Income taxes at statutory rates (federal and state)
 
$
8,500

 
$
11,097

 
$
9,363

 
$
11,081

Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
(3,207
)
 
569

 
(3,207
)
 
569

Other, net
 
(336
)
 
(475
)
 
(336
)
 
(476
)
Total provision for income taxes on continuing operations
 
$
4,957

 
$
11,191

 
$
5,820

 
$
11,174

Effective tax rate for continuing operations
 
15.5
%
 
26.8
%
 
16.5
%
 
26.8
%