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Quarterly Financial Information
 12 Months Ended
Dec. 31, 2016
Schedule Of Quarterly Financial Information [Abstract]  
Quarterly Financial Information [Text Block]
NORTHWEST NATURAL GAS COMPANY
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
 
 
Quarter ended
In thousands, except share data
 
March 31
 
June 30
 
September 30
 
December 31
2016
 
 
 
 
 
 
 
 
Operating revenues
 
$
255,529

 
$
99,183

 
$
87,727

 
$
233,528

Net income (loss)
 
36,641

 
2,019

 
(8,040
)
 
28,275

Basic earnings (loss) per share(1)
 
1.33

 
0.07

 
(0.29
)
 
1.01

Diluted earnings (loss) per share(1)
 
1.33

 
0.07

 
(0.29
)
 
1.00

2015
 
 

 
 
 
 

 
 

Operating revenues
 
$
261,665

 
$
138,280

 
$
93,128

 
$
230,718

Net income (loss)
 
28,486

 
2,197

 
(6,685
)
 
29,705

Basic earnings (loss) per share(1)
 
1.04

 
0.08

 
(0.24
)
 
1.08

Diluted earnings (loss) per share(1)
 
1.04

 
0.08

 
(0.24
)
 
1.08


(1)
Quarterly earnings (loss) per share are based upon the average number of common shares outstanding during each quarter. Variations in earnings between quarterly periods are due primarily to the seasonal nature of our business.