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Segment financial information (Tables)
 12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Schedule of segment financial information
Segment financial information was as follows:
(in thousands)
Electric utility
 
Bank

 
Other

 
Total

2013
 

 
 

 
 

 
 

Revenues from external customers
$
2,980,139

 
$
258,147

 
$
184

 
$
3,238,470

Intersegment revenues (eliminations)
33

 
—

 
(33
)
 
—

Revenues
2,980,172

 
258,147

 
151

 
3,238,470

Depreciation and amortization
159,102

 
4,230

 
1,396

 
164,728

Interest expense, net
59,279

 
10,077

 
16,200

 
85,556

Income (loss) before income taxes
194,041

 
87,059

 
(33,353
)
 
247,747

Income taxes (benefit)
69,117

 
29,525

 
(14,301
)
 
84,341

Net income (loss)
124,924

 
57,534

 
(19,052
)
 
163,406

Preferred stock dividends of subsidiaries
1,995

 
—

 
(105
)
 
1,890

Net income (loss) for common stock
122,929

 
57,534

 
(18,947
)
 
161,516

Capital expenditures
342,485

 
11,193

 
201

 
353,879

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

 
5,243,824

 
9,091

 
10,340,044

2012
 

 
 

 
 

 
 

Revenues from external customers
$
3,109,353

 
$
265,539

 
$
103

 
$
3,374,995

Intersegment revenues (eliminations)
86

 
—

 
(86
)
 
—

Revenues
3,109,439

 
265,539

 
17

 
3,374,995

Depreciation and amortization
151,496

 
5,334

 
1,517

 
158,347

Interest expense, net
62,055

 
11,292

 
16,096

 
89,443

Income (loss) before income taxes
162,319

 
89,021

 
(33,933
)
 
217,407

Income taxes (benefit)
61,048

 
30,384

 
(14,573
)
 
76,859

Net income (loss)
101,271

 
58,637

 
(19,360
)
 
140,548

Preferred stock dividends of subsidiaries
1,995

 
—

 
(105
)
 
1,890

Net income (loss) for common stock
99,276

 
58,637

 
(19,255
)
 
138,658

Capital expenditures
310,091

 
14,979

 
410

 
325,480

Assets (at December 31, 2012)
5,108,793

 
5,041,673

 
(1,334
)
 
10,149,132

2011
 

 
 

 
 

 
 

Revenues from external customers
$
2,978,547

 
$
264,407

 
$
(619
)
 
$
3,242,335

Intersegment revenues (eliminations)
143

 
—

 
(143
)
 
—

Revenues
2,978,690

 
264,407

 
(762
)
 
3,242,335

Depreciation and amortization
160,353

 
5,909

 
1,208

 
167,470

Interest expense, net
60,031

 
14,469

 
22,075

 
96,575

Income (loss) before income taxes
163,565

 
91,536

 
(39,049
)
 
216,052

Income taxes (benefit)
61,584

 
31,693

 
(17,345
)
 
75,932

Net income (loss)
101,981

 
59,843

 
(21,704
)
 
140,120

Preferred stock dividends of subsidiaries
1,995

 
—

 
(105
)
 
1,890

Net income (loss) for common stock
99,986

 
59,843

 
(21,599
)
 
138,230

Capital expenditures
226,022

 
8,984

 
110

 
235,116

Assets (at December 31, 2011)
4,674,007

 
4,909,974

 
10,496

 
9,594,477