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Segment Information
 12 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Segment Information
SEGMENT INFORMATION
We have determined that we have two reportable segments: (1) Gas Utility and (2) Electric Utility. Gas Utility revenues are derived principally from the sale and distribution of natural gas to customers in eastern and central Pennsylvania. Electric Utility derives its revenues principally from the sale and distribution of electricity in two northeastern Pennsylvania counties.
The accounting policies of our reportable segments are the same as those described in Note 2. Our Chief Operating Decision Maker evaluates the performance of our Gas Utility and Electric Utility segments principally based upon their income before income taxes.
No single customer represents more than ten percent of our consolidated revenues and there are no significant intersegment transactions. In addition, all of our reportable segments’ revenues are derived from sources within the United States, and all of our reportable segments’ long-lived assets are located in the United States. Financial information by business segment follows:
 
Total
 
Gas
Utility
 
Electric
Utility
2018
 
 
 
 
 
Revenues
$
1,092,381

 
$
994,814

 
$
97,567

Cost of sales
$
522,911

 
$
467,528

 
$
55,383

Depreciation
$
84,644

 
$
79,124

 
$
5,520

Operating income
$
237,522

 
$
230,430

 
$
7,092

Interest expense
$
42,890

 
$
41,414

 
$
1,476

Income before income taxes
$
194,632

 
$
189,016

 
$
5,616

Total assets
$
3,266,576

 
$
3,075,992

 
$
190,584

Goodwill
$
182,145

 
$
182,145

 
$
—

Capital expenditures (including the effects of accruals)
$
338,548

 
$
320,018

 
$
18,530

2017
 
 
 
 
 
Revenues
$
887,588

 
$
799,054

 
$
88,534

Cost of sales
$
367,279

 
$
318,210

 
$
49,069

Depreciation
$
72,332

 
$
67,357

 
$
4,975

Operating income
$
228,307

 
$
219,561

 
$
8,746

Interest expense
$
40,212

 
$
38,218

 
$
1,994

Income before income taxes
$
188,095

 
$
181,343

 
$
6,752

Total assets
$
2,994,015

 
$
2,833,423

 
$
160,592

Goodwill
$
182,145

 
$
182,145

 
$
—

Capital expenditures (including the effects of accruals)
$
317,722

 
$
306,243

 
$
11,479

2016
 
 
 
 
 
Revenues
$
768,484

 
$
677,387

 
$
91,097

Cost of sales
$
289,786

 
$
239,163

 
$
50,623

Depreciation
$
67,303

 
$
62,451

 
$
4,852

Operating income
$
200,901

 
$
189,412

 
$
11,489

Interest expense
$
37,630

 
$
35,786

 
$
1,844

Income before income taxes
$
163,271

 
$
153,626

 
$
9,645

Total assets
$
2,743,091

 
$
2,570,297

 
$
172,794

Goodwill
$
182,145

 
$
182,145

 
$
—

Capital expenditures (including the effects of accruals)
$
262,503

 
$
251,261

 
$
11,242