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Segment financial information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment financial information |  |  |
Total revenues | $ 550,960 | $ 637,862 |
Income (loss) before income taxes | 51,126 | 52,318 |
Income taxes (benefit) | 18,301 | 19,979 |
Net income | 32,825 | 32,339 |
Preferred stock dividends of subsidiaries | 473 | 473 |
Net income for common stock | 32,352 | 31,866 |
Total assets | 11,870,506 |  | $ 11,782,018
Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 482,052 | 573,442 |
Income (loss) before income taxes | 40,419 | 43,223 |
Income taxes (benefit) | 14,553 | 15,850 |
Net income | 25,866 | 27,373 |
Preferred stock dividends of subsidiaries | 499 | 499 |
Net income for common stock | 25,367 | 26,874 |
Total assets | 5,662,371 |  | 5,672,210
Bank |  |  |
Segment financial information |  |  |
Total revenues | 68,840 | 64,348 |
Income (loss) before income taxes | 19,594 | 20,631 |
Income taxes (benefit) | 6,921 | 7,156 |
Net income | 12,673 | 13,475 |
Net income for common stock | 12,673 | 13,475 |
Total assets | 6,140,514 |  | 6,014,755
Other |  |  |
Segment financial information |  |  |
Total revenues | 68 | 72 |
Income (loss) before income taxes | (8,887) | (11,536) |
Income taxes (benefit) | (3,173) | (3,027) |
Net income | (5,714) | (8,509) |
Preferred stock dividends of subsidiaries | (26) | (26) |
Net income for common stock | (5,688) | (8,483) |
Total assets | 67,621 |  | $ 95,053
Revenues from external customers |  |  |
Segment financial information |  |  |
Total revenues | 550,960 | 637,862 |
Revenues from external customers | Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 482,045 | 573,431 |
Revenues from external customers | Bank |  |  |
Segment financial information |  |  |
Total revenues | 68,840 | 64,348 |
Revenues from external customers | Other |  |  |
Segment financial information |  |  |
Total revenues | 75 | 83 |
Intersegment revenues (eliminations) | Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 7 | 11 |
Intersegment revenues (eliminations) | Other |  |  |
Segment financial information |  |  |
Total revenues | $ (7) | $ (11) |

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