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Segment financial information
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
 
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended March 31, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
482,045

 
$
68,840

 
$
75

 
$
550,960

Intersegment revenues (eliminations)
 
7

 
—

 
(7
)
 
—

Revenues
 
482,052

 
68,840

 
68

 
550,960

Income (loss) before income taxes
 
40,419

 
19,594

 
(8,887
)
 
51,126

Income taxes (benefit)
 
14,553

 
6,921

 
(3,173
)
 
18,301

Net income (loss)
 
25,866

 
12,673

 
(5,714
)
 
32,825

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
25,367

 
12,673

 
(5,688
)
 
32,352

Total assets (at March 31, 2016)
 
5,662,371

 
6,140,514

 
67,621

 
11,870,506

Three months ended March 31, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
573,431

 
$
64,348

 
$
83

 
$
637,862

Intersegment revenues (eliminations)
 
11

 
—

 
(11
)
 
—

Revenues
 
573,442

 
64,348

 
72

 
637,862

Income (loss) before income taxes
 
43,223

 
20,631

 
(11,536
)
 
52,318

Income taxes (benefit)
 
15,850

 
7,156

 
(3,027
)
 
19,979

Net income (loss)
 
27,373

 
13,475

 
(8,509
)
 
32,339

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
26,874

 
13,475

 
(8,483
)
 
31,866

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.