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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
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
 
Sept. 30
 
Dec. 31
2012
 
 
 
 
 
 
 
 
Operating revenues
 
$
309,639

 
$
103,991

 
$
87,501

 
$
229,476

Net income (loss)
 
40,607

 
1,409

 
(10,558
)
 
28,397

Basic earnings (loss) per share(1)
 
1.52

 
0.05

 
(0.39
)
 
1.06

Diluted earnings (loss) per share(1)
 
1.51

 
0.05

 
(0.39
)
 
1.05

2011
 
 

 
 

 
 

 
 

Operating revenues
 
$
315,133

 
$
157,354

 
$
90,916

 
$
264,652

Net income (loss)
 
40,773

 
2,193

 
(8,312
)
 
29,244

Basic earnings (loss) per share(1)
 
1.53

 
0.08

 
(0.31
)
 
1.09

Diluted earnings (loss) per share(1)
 
1.53

 
0.08

 
(0.31
)
 
1.09


(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.