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Quarterly Financial Data
 12 Months Ended
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
Quarterly Financial Data (unaudited)
In the opinion of management, the following quarterly information includes all adjustments necessary for a fair statement of the results of operations for such periods. Per common share amounts are calculated using the weighted average number of shares outstanding during each quarter. The total of all quarters may differ from the per common share amounts shown on the Consolidated Statements of Income. Those per common share amounts are based on the weighted average number of shares outstanding for the entire fiscal year. Because of the seasonal nature of the Company’s heating business, there are substantial variations in operations reported on a quarterly basis. 
 
Quarter Ended
Operating
Revenues
 
Operating
Income (Loss)
 
Net 
Income (Loss)
Available for
Common Stock
 
Earnings (Loss) per
Common Share
 
 
Basic
 
Diluted
 
 
(Thousands, except per common share amounts)
 
2017
 
 
 
 
 
 
 
 
 
 
9/30/2017
$
286,937

 
$
87,395

 
$
45,577

 
$
0.53

 
$
0.53

 
6/30/2017
$
348,369

 
$
123,354

 
$
59,714

 
$
0.70

 
$
0.69

 
3/31/2017
$
522,075

 
$
169,957

 
$
89,283

 
$
1.05

 
$
1.04

 
12/31/2016
$
422,500

 
$
172,139

 
$
88,908

 
$
1.04

 
$
1.04

 
2016
 
 
 
 
 
 
 
 
 
 
9/30/2016
$
292,472

 
$
81,244

 
$
37,553

(1)
$
0.44

 
$
0.44

 
6/30/2016
$
335,617

 
$
45,162

 
$
8,286

(2)
$
0.10

 
$
0.10

 
3/31/2016
$
449,132

 
$
(237,000
)
 
$
(147,688
)
(3)
$
(1.74
)
 
$
(1.74
)
 
12/31/2015
$
375,195

 
$
(305,924
)
 
$
(189,109
)
(4)
$
(2.23
)
 
$
(2.23
)
 
(1)
Includes a non-cash $32.7 million impairment charge ($19.0 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.
(2)
Includes a non-cash $82.7 million impairment charge ($47.9 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.
(3)
Includes a non-cash $397.4 million impairment charge ($230.5 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.
(4)
Includes a non-cash $435.5 million impairment charge ($252.6 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.