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Segment financial information
 6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
 
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
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

Assets (at June 30, 2015)
 
5,634,307

 
5,777,098

 
28,226

 
11,439,631

Three months ended June 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
738,423

 
$
60,616

 
$
(382
)
 
$
798,657

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
738,429

 
60,616

 
(388
)
 
798,657

Income (loss) before income taxes
 
55,126

 
17,956

 
(8,011
)
 
65,071

Income taxes (benefit)
 
20,397

 
6,420

 
(3,500
)
 
23,317

Net income (loss)
 
34,729

 
11,536

 
(4,511
)
 
41,754

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
34,230

 
11,536

 
(4,485
)
 
41,281

Six months ended June 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,458,479

 
$
124,235

 
$
(308
)
 
$
1,582,406

Intersegment revenues (eliminations)
 
12

 
—

 
(12
)
 
—

Revenues
 
1,458,491

 
124,235

 
(320
)
 
1,582,406

Income (loss) before income taxes
 
112,292

 
40,488

 
(15,728
)
 
137,052

Income taxes (benefit)
 
41,644

 
14,553

 
(7,159
)
 
49,038

Net income (loss)
 
70,648

 
25,935

 
(8,569
)
 
88,014

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
69,650

 
25,935

 
(8,517
)
 
87,068

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.