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Segment financial information
 6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
 
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
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

 
17,048

 
(8,011
)
 
64,163

Income taxes (benefit)
 
20,397

 
5,372

 
(3,500
)
 
22,269

Net income (loss)
 
34,729

 
11,676

 
(4,511
)
 
41,894

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
34,230

 
11,676

 
(4,485
)
 
41,421

 
 
 
 
 
 
 
 
 
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

 
38,672

 
(15,728
)
 
135,236

Income taxes (benefit)
 
41,644

 
12,457

 
(7,159
)
 
46,942

Net income (loss)
 
70,648

 
26,215

 
(8,569
)
 
88,294

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
69,650

 
26,215

 
(8,517
)
 
87,348

Assets (at June 30, 2014)
 
5,199,841

 
5,418,127

 
(825
)
 
10,617,143

 
 
 
 
 
 
 
 
 
Three months ended June 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
728,519

 
$
66,027

 
$
21

 
$
794,567

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
728,525

 
66,027

 
15

 
794,567

Income (loss) before income taxes
 
46,525

 
24,705

 
(7,507
)
 
63,723

Income taxes (benefit)
 
17,333

 
8,786

 
(3,457
)
 
22,662

Net income (loss)
 
29,192

 
15,919

 
(4,050
)
 
41,061

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
28,693

 
15,919

 
(4,024
)
 
40,588

 
 
 
 
 
 
 
 
 
Six months ended June 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,445,954

 
$
130,783

 
$
62

 
$
1,576,799

Intersegment revenues (eliminations)
 
12

 
—

 
(12
)
 
—

Revenues
 
1,445,966

 
130,783

 
50

 
1,576,799

Income (loss) before income taxes
 
85,072

 
46,457

 
(15,767
)
 
115,762

Income taxes (benefit)
 
30,952

 
16,383

 
(6,786
)
 
40,549

Net income (loss)
 
54,120

 
30,074

 
(8,981
)
 
75,213

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
53,122

 
30,074

 
(8,929
)
 
74,267

Assets (at December 31, 2013)
 
5,087,129

 
5,243,824

 
9,091

 
10,340,044


 
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.