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Segment financial information
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended September 30, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
572,208

 
$
73,708

 
$
139

 
$
646,055

Intersegment revenues (eliminations)
 
45

 
—

 
(45
)
 
—

Revenues
 
572,253

 
73,708

 
94

 
646,055

Income (loss) before income taxes
 
75,617

 
22,727

 
80,861

 
179,205

Income taxes (benefit)
 
28,145

 
7,623

 
15,824

 
51,592

Net income (loss)
 
47,472

 
15,104

 
65,037

 
127,613

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
46,974

 
15,104

 
65,064

 
127,142

Nine months ended September 30, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,549,602

 
$
213,297

 
$
360

 
$
1,763,259

Intersegment revenues (eliminations)
 
98

 
—

 
(98
)
 
—

Revenues
 
1,549,700

 
213,297

 
262

 
1,763,259

Income (loss) before income taxes
 
174,376

 
62,545

 
64,321

 
301,242

Income taxes (benefit)
 
64,682

 
21,483

 
10,038

 
96,203

Net income (loss)
 
109,694

 
41,062

 
54,283

 
205,039

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
108,198

 
41,062

 
54,362

 
203,622

Total assets (at September 30, 2016)
 
5,800,826

 
6,336,670

 
61,489

 
12,198,985

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

Total assets (at December 31, 2015)*
 
5,672,210

 
6,014,755

 
95,053

 
11,782,018


 
* See Note 11 for the impact to prior period financial information of the adoption of Accounting Standards Update (ASU) No. 2015-03.
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 and the profit on such sales is nominal.
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 and the profit on such fees is nominal.