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Segment financial information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Segment financial information |  |  |  |  |
Revenues from external customers | $ 867,720 | $ 886,355 | $ 2,536,848 | $ 2,391,307 |
Total revenues | 867,720 | 886,355 | 2,536,848 | 2,391,307 |
Income (loss) before income taxes | 73,981 | 76,769 | 196,165 | 163,122 |
Income taxes (benefit) | 25,804 | 27,894 | 69,926 | 57,700 |
Net income | 48,177 | 48,875 | 126,239 | 105,422 |
Preferred stock dividends of subsidiaries | 471 | 471 | 1,417 | 1,417 |
Net income for common stock | 47,706 | 48,404 | 124,822 | 104,005 |
Assets | 9,904,827 |  | 9,904,827 |  | 9,594,477
Electric utility |  |  |  |  |
Segment financial information |  |  |  |  |
Revenues from external customers | 801,089 | 820,218 | 2,340,202 | 2,194,219 |
Intersegment revenues (eliminations) | 6 | 36 | 55 | 108 |
Total revenues | 801,095 | 820,254 | 2,340,257 | 2,194,327 |
Income (loss) before income taxes | 61,268 | 62,244 | 154,976 | 122,114 |
Income taxes (benefit) | 22,395 | 23,787 | 58,429 | 46,446 |
Net income | 38,873 | 38,457 | 96,547 | 75,668 |
Preferred stock dividends of subsidiaries | 498 | 498 | 1,496 | 1,496 |
Net income for common stock | 38,375 | 37,959 | 95,051 | 74,172 |
Assets | 4,961,715 |  | 4,961,715 |  | 4,674,007
Bank |  |  |  |  |
Segment financial information |  |  |  |  |
Revenues from external customers | 66,596 | 66,100 | 196,569 | 197,731 |
Total revenues | 66,596 | 66,100 | 196,569 | 197,731 |
Income (loss) before income taxes | 21,627 | 23,166 | 66,964 | 68,699 |
Income taxes (benefit) | 7,419 | 7,709 | 22,690 | 24,196 |
Net income | 14,208 | 15,457 | 44,274 | 44,503 |
Net income for common stock | 14,208 | 15,457 | 44,274 | 44,503 |
Assets | 4,870,660 |  | 4,870,660 |  | 4,909,974
Other |  |  |  |  |
Segment financial information |  |  |  |  |
Revenues from external customers | 35 | 37 | 77 | (643) |
Intersegment revenues (eliminations) | (6) | (36) | (55) | (108) |
Total revenues | 29 | 1 | 22 | (751) |
Income (loss) before income taxes | (8,914) | (8,641) | (25,775) | (27,691) |
Income taxes (benefit) | (4,010) | (3,602) | (11,193) | (12,942) |
Net income | (4,904) | (5,039) | (14,582) | (14,749) |
Preferred stock dividends of subsidiaries | (27) | (27) | (79) | (79) |
Net income for common stock | (4,877) | (5,012) | (14,503) | (14,670) |
Assets | $ (9,738) |  | $ (9,738) |  | $ 10,496

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