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Segment financial information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment financial information |  |  |  |  |
Revenues from external customers | $ 831,229 | $ 867,720 | $ 2,412,023 | $ 2,536,848 |
Total revenues | 831,229 | 867,720 | 2,412,023 | 2,536,848 |
Income (loss) before income taxes | 71,548 | 73,981 | 189,077 | 196,165 |
Income taxes (benefit) | 22,841 | 25,804 | 65,157 | 69,926 |
Net income | 48,707 | 48,177 | 123,920 | 126,239 |
Preferred stock dividends of subsidiaries | 471 | 471 | 1,417 | 1,417 |
Net income for common stock | 48,236 | 47,706 | 122,503 | 124,822 |
Assets | 10,429,012 |  | 10,429,012 |  | 10,149,132
Electric utility |  |  |  |  |
Segment financial information |  |  |  |  |
Revenues from external customers | 766,109 | 801,089 | 2,216,058 | 2,340,202 |
Intersegment revenues (eliminations) | 6 | 6 | 18 | 55 |
Total revenues | 766,115 | 801,095 | 2,216,076 | 2,340,257 |
Income (loss) before income taxes | 57,373 | 61,268 | 144,212 | 154,976 |
Income taxes (benefit) | 19,058 | 22,395 | 51,777 | 58,429 |
Net income | 38,315 | 38,873 | 92,435 | 96,547 |
Preferred stock dividends of subsidiaries | 498 | 498 | 1,496 | 1,496 |
Net income for common stock | 37,817 | 38,375 | 90,939 | 95,051 |
Assets | 5,269,758 |  | 5,269,758 |  | 5,108,793
Bank |  |  |  |  |
Segment financial information |  |  |  |  |
Revenues from external customers | 65,058 | 66,596 | 195,841 | 196,569 |
Total revenues | 65,058 | 66,596 | 195,841 | 196,569 |
Income (loss) before income taxes | 22,808 | 21,627 | 69,265 | 66,964 |
Income taxes (benefit) | 7,532 | 7,419 | 23,915 | 22,690 |
Net income | 15,276 | 14,208 | 45,350 | 44,274 |
Net income for common stock | 15,276 | 14,208 | 45,350 | 44,274 |
Assets | 5,159,372 |  | 5,159,372 |  | 5,041,673
Other |  |  |  |  |
Segment financial information |  |  |  |  |
Revenues from external customers | 62 | 35 | 124 | 77 |
Intersegment revenues (eliminations) | (6) | (6) | (18) | (55) |
Total revenues | 56 | 29 | 106 | 22 |
Income (loss) before income taxes | (8,633) | (8,914) | (24,400) | (25,775) |
Income taxes (benefit) | (3,749) | (4,010) | (10,535) | (11,193) |
Net income | (4,884) | (4,904) | (13,865) | (14,582) |
Preferred stock dividends of subsidiaries | (27) | (27) | (79) | (79) |
Net income for common stock | (4,857) | (4,877) | (13,786) | (14,503) |
Assets | $ (118) |  | $ (118) |  | $ (1,334)

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