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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2015
Schedule Of Quarterly Financial Information [Abstract]  
Schedule of Quarterly Financial Information [Table 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
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

2014
 
 

 
 
 
 

 
 

Operating revenues
 
$
293,386

 
$
133,169

 
$
87,199

 
$
240,283

Net income (loss)
 
37,884

 
1,071

 
(8,733
)
 
28,470

Basic earnings (loss) per share(1)
 
1.40

 
0.04

 
(0.32
)
 
1.05

Diluted earnings (loss) per share(1)
 
1.40

 
0.04

 
(0.32
)
 
1.04


(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.