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Income Tax (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
 
NW Holdings
 
NW Natural
Dollars in thousands
 
2019
 
2018
 
2019

2018
Income taxes at statutory rates (federal and state)
 
$
14,313

 
$
15,368

 
$
14,485

 
$
15,372

Increase (decrease):
 
 
 
 
 
 
 
 

Differences required to be flowed-through by regulatory commissions
 
(5,260
)
 
849

 
(5,260
)
 
849

Other, net
 
(378
)
 
(585
)
 
(377
)
 
(586
)
Total provision for income taxes on continuing operations
 
$
8,675

 
$
15,632

 
$
8,848

 
$
15,635

Effective tax rate for continuing operations
 
16.7
%
 
27.1
%
 
16.8
%
 
27.1
%