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Segment financial information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 3,238,470 | $ 3,374,995 | $ 3,242,335
Intersegment revenues (eliminations) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues | 826,447 | 831,229 | 796,730 | 784,064 | 838,147 | 867,720 | 854,268 | 814,860 | 3,238,470 | 3,374,995 | 3,242,335
Depreciation and amortization |  |  |  |  |  |  |  |  | 164,728 | 158,347 | 167,470
Interest expense |  |  |  |  |  |  |  |  | 85,556 | 89,443 | 96,575
Income before income taxes |  |  |  |  |  |  |  |  | 247,747 | 217,407 | 216,052
Income taxes (benefit) |  |  |  |  |  |  |  |  | 84,341 | 76,859 | 75,932
Net income | 39,486 | 48,707 | 41,061 | 34,152 | 14,309 | 48,177 | 39,273 | 38,789 | 163,406 | 140,548 | 140,120
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 1,890 | 1,890 | 1,890
Net income for common stock | 39,013 | 48,236 | 40,588 | 33,679 | 13,836 | 47,706 | 38,800 | 38,316 | 161,516 | 138,658 | 138,230
Capital expenditures |  |  |  |  |  |  |  |  | 353,879 | 325,480 | 235,116
Assets | 10,340,044 |  |  |  | 10,149,132 |  |  |  | 10,340,044 | 10,149,132 | 9,594,477
Electric utility |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Number of entities involved |  |  |  |  |  |  |  |  | 3 |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 2,980,139 | 3,109,353 | 2,978,547
Intersegment revenues (eliminations) |  |  |  |  |  |  |  |  | 33 | 86 | 143
Total revenues |  |  |  |  |  |  |  |  | 2,980,172 | 3,109,439 | 2,978,690
Depreciation and amortization |  |  |  |  |  |  |  |  | 159,102 | 151,496 | 160,353
Interest expense |  |  |  |  |  |  |  |  | 59,279 | 62,055 | 60,031
Income before income taxes |  |  |  |  |  |  |  |  | 194,041 | 162,319 | 163,565
Income taxes (benefit) |  |  |  |  |  |  |  |  | 69,117 | 61,048 | 61,584
Net income |  |  |  |  |  |  |  |  | 124,924 | 101,271 | 101,981
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 1,995 | 1,995 | 1,995
Net income for common stock |  |  |  |  |  |  |  |  | 122,929 | 99,276 | 99,986
Capital expenditures |  |  |  |  |  |  |  |  | 342,485 | 310,091 | 226,022
Assets | 5,087,129 |  |  |  | 5,108,793 |  |  |  | 5,087,129 | 5,108,793 | 4,674,007
Bank |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 258,147 | 265,539 | 264,407
Intersegment revenues (eliminations) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  | 258,147 | 265,539 | 264,407
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,230 | 5,334 | 5,909
Interest expense |  |  |  |  |  |  |  |  | 10,077 | 11,292 | 14,469
Income before income taxes |  |  |  |  |  |  |  |  | 87,059 | 89,021 | 91,536
Income taxes (benefit) |  |  |  |  |  |  |  |  | 29,525 | 30,384 | 31,693
Net income |  |  |  |  |  |  |  |  | 57,534 | 58,637 | 59,843
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income for common stock |  |  |  |  |  |  |  |  | 57,534 | 58,637 | 59,843
Capital expenditures |  |  |  |  |  |  |  |  | 11,193 | 14,979 | 8,984
Assets | 5,243,824 |  |  |  | 5,041,673 |  |  |  | 5,243,824 | 5,041,673 | 4,909,974
Other |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 184 | 103 | (619)
Intersegment revenues (eliminations) |  |  |  |  |  |  |  |  | (33) | (86) | (143)
Total revenues |  |  |  |  |  |  |  |  | 151 | 17 | (762)
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,396 | 1,517 | 1,208
Interest expense |  |  |  |  |  |  |  |  | 16,200 | 16,096 | 22,075
Income before income taxes |  |  |  |  |  |  |  |  | (33,353) | (33,933) | (39,049)
Income taxes (benefit) |  |  |  |  |  |  |  |  | (14,301) | (14,573) | (17,345)
Net income |  |  |  |  |  |  |  |  | (19,052) | (19,360) | (21,704)
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | (105) | (105) | (105)
Net income for common stock |  |  |  |  |  |  |  |  | (18,947) | (19,255) | (21,599)
Capital expenditures |  |  |  |  |  |  |  |  | 201 | 410 | 110
Assets | $ 9,091 |  |  |  | $ (1,334) |  |  |  | $ 9,091 | $ (1,334) | $ 10,496

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