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Quarterly Financial Information
 12 Months Ended
Dec. 31, 2017
Schedule Of Quarterly Financial Information [Abstract]  
Quarterly Financial Information [Text Block]
NORTHWEST NATURAL GAS COMPANY
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
 
 
Quarter ended(1)
In thousands, except per share data
 
March 31
 
June 30
 
September 30
 
December 31
2017
 
 
 
 
 
 
 
 
Operating revenues
 
$
295,724

 
$
134,476

 
$
86,212

 
$
238,626

Net income (loss) from continuing operations
 
41,397

 
4,075

 
(7,887
)
 
34,488

Loss from discontinued operations, net of tax
 
(1,087
)
 
(1,346
)
 
(608
)
 
(124,655
)
Net income (loss)
 
40,310

 
2,729

 
(8,495
)
 
(90,167
)
Average common shares outstanding:
 
 
 
 
 
 
 
 
Basic
 
28,633

 
28,648

 
28,678

 
28,716

Diluted
 
28,723

 
28,717

 
28,678

 
28,797

Earnings (loss) from continuing operations per share of common stock:
 
 
 
 
 
 
 
 
Basic
 
1.45

 
0.14

 
(0.28
)
 
1.20

Diluted
 
1.44

 
0.14

 
(0.28
)
 
1.20

Loss from discontinued operations per share of common stock:
 
 
 
 
 
 
 
 
Basic
 
(0.04
)
 
(0.04
)
 
(0.02
)
 
(4.34
)
Diluted
 
(0.04
)
 
(0.04
)
 
(0.02
)
 
(4.33
)
Earnings (loss) per share of common stock:
 
 
 
 
 
 
 
 
Basic
 
1.41

 
0.10

 
(0.30
)
 
(3.14
)
Diluted
 
1.40

 
0.10

 
(0.30
)
 
(3.13
)
 
 
 
 
 
 
 
 
 
2016
 
 

 
 
 
 

 
 

Operating revenues
 
$
253,934

 
$
97,077

 
$
85,457

 
$
231,705

Net income (loss) from continuing operations
 
37,511

 
2,793

 
(7,505
)
 
29,620

Loss from discontinued operations, net of tax
 
(870
)
 
(774
)
 
(535
)
 
(1,345
)
Net income (loss)
 
36,641

 
2,019

 
(8,040
)
 
28,275

Average common shares outstanding:
 
 
 
 
 
 
 
 
Basic
 
27,448

 
27,510

 
27,554

 
28,071

Diluted
 
27,560

 
27,632

 
27,554

 
28,202

Earnings (loss) from continuing operations per share of common stock:
 
 
 
 
 
 
 
 
Basic
 
1.37

 
0.10

 
(0.27
)
 
1.06

Diluted
 
1.36

 
0.10

 
(0.27
)
 
1.05

Loss from discontinued operations per share of common stock:
 
 
 
 
 
 
 
 
Basic
 
(0.03
)
 
(0.03
)
 
(0.02
)
 
(0.05
)
Diluted
 
(0.03
)
 
(0.03
)
 
(0.02
)
 
(0.05
)
Earnings (loss) per share of common stock:
 
 
 
 
 
 
 
 
Basic
 
1.33

 
0.07

 
(0.29
)
 
1.01

Diluted
 
1.33

 
0.07

 
(0.29
)
 
1.00

(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.