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Segment financial information
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
 
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended September 30, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
648,121

 
$
69,091

 
$
(36
)
 
$
717,176

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
648,127

 
69,091

 
(42
)
 
717,176

Income (loss) before income taxes
 
68,894

 
20,802

 
(9,036
)
 
80,660

Income taxes (benefit)
 
25,390

 
7,351

 
(3,225
)
 
29,516

Net income (loss)
 
43,504

 
13,451

 
(5,811
)
 
51,144

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
43,006

 
13,451

 
(5,784
)
 
50,673

Nine months ended September 30, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,779,708

 
$
199,222

 
$
20

 
$
1,978,950

Intersegment revenues (eliminations)
 
24

 
—

 
(24
)
 
—

Revenues
 
1,779,732

 
199,222

 
(4
)
 
1,978,950

Income (loss) before income taxes
 
164,568

 
61,159

 
(36,347
)
 
189,380

Income taxes (benefit)
 
60,351

 
21,382

 
(11,327
)
 
70,406

Net income (loss)
 
104,217

 
39,777

 
(25,020
)
 
118,974

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
102,721

 
39,777

 
(24,941
)
 
117,557

Assets (at September 30, 2015)
 
5,683,992

 
5,855,497

 
33,977

 
11,573,466

Three months ended September 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
803,559

 
$
63,536

 
$
1

 
$
867,096

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
803,565

 
63,536

 
(5
)
 
867,096

Income (loss) before income taxes
 
62,419

 
20,506

 
(7,382
)
 
75,543

Income taxes (benefit)
 
23,042

 
7,253

 
(3,031
)
 
27,264

Net income (loss)
 
39,377

 
13,253

 
(4,351
)
 
48,279

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
38,879

 
13,253

 
(4,324
)
 
47,808

Nine months ended September 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
2,262,038

 
$
187,771

 
$
(307
)
 
$
2,449,502

Intersegment revenues (eliminations)
 
18

 
—

 
(18
)
 
—

Revenues
 
2,262,056

 
187,771

 
(325
)
 
2,449,502

Income (loss) before income taxes
 
174,711

 
60,994

 
(23,110
)
 
212,595

Income taxes (benefit)
 
64,686

 
21,806

 
(10,190
)
 
76,302

Net income (loss)
 
110,025

 
39,188

 
(12,920
)
 
136,293

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
108,529

 
39,188

 
(12,841
)
 
134,876

Assets (at December 31, 2014)
 
5,590,457

 
5,566,222

 
28,463

 
11,185,142


 
Intercompany electricity sales of the Utilities to the bank and “other” segments are not eliminated because those segments would need to purchase electricity from another source if it were not provided by the Utilities, the profit on such sales is nominal and the elimination of electric sales revenues and expenses could distort segment operating income and net income for common stock.
Bank fees that ASB charges the Utilities and “other” segments are not eliminated because those segments would pay fees to another financial institution if they were to bank with another institution, the profit on such fees is nominal and the elimination of bank fee income and expenses could distort segment operating income and net income for common stock.