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

 
 

 
 

 
 

Revenues from external customers
 
$
495,349

 
$
70,749

 
$
146

 
$
566,244

Intersegment revenues (eliminations)
 
46

 
—

 
(46
)
 
—

Revenues
 
495,395

 
70,749

 
100

 
566,244

Income (loss) before income taxes
 
58,340

 
20,224

 
(7,653
)
 
70,911

Income taxes (benefit)
 
21,984

 
6,939

 
(2,613
)
 
26,310

Net income (loss)
 
36,356

 
13,285

 
(5,040
)
 
44,601

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
35,857

 
13,285

 
(5,014
)
 
44,128

Six months ended June 30, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
977,394

 
$
139,589

 
$
221

 
$
1,117,204

Intersegment revenues (eliminations)
 
53

 
—

 
(53
)
 
—

Revenues
 
977,447

 
139,589

 
168

 
1,117,204

Income (loss) before income taxes
 
98,759

 
39,818

 
(16,540
)
 
122,037

Income taxes (benefit)
 
36,537

 
13,860

 
(5,786
)
 
44,611

Net income (loss)
 
62,222

 
25,958

 
(10,754
)
 
77,426

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
61,224

 
25,958

 
(10,702
)
 
76,480

Total assets (at June 30, 2016)
 
5,721,853

 
6,188,090

 
69,296

 
11,979,239

Three months ended June 30, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
558,156

 
$
65,783

 
$
(27
)
 
$
623,912

Intersegment revenues (eliminations)
 
7

 
—

 
(7
)
 
—

Revenues
 
558,163

 
65,783

 
(34
)
 
623,912

Income (loss) before income taxes
 
52,451

 
19,726

 
(15,775
)
 
56,402

Income taxes (benefit)
 
19,111

 
6,875

 
(5,075
)
 
20,911

Net income (loss)
 
33,340

 
12,851

 
(10,700
)
 
35,491

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
32,841

 
12,851

 
(10,674
)
 
35,018

Six months ended June 30, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,131,587

 
$
130,131

 
$
56

 
$
1,261,774

Intersegment revenues (eliminations)
 
18

 
—

 
(18
)
 
—

Revenues
 
1,131,605

 
130,131

 
38

 
1,261,774

Income (loss) before income taxes
 
95,674

 
40,357

 
(27,311
)
 
108,720

Income taxes (benefit)
 
34,961

 
14,031

 
(8,102
)
 
40,890

Net income (loss)
 
60,713

 
26,326

 
(19,209
)
 
67,830

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
59,715

 
26,326

 
(19,157
)
 
66,884

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.