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Segment financial information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment financial information |  |  |  |
Total revenues |  | $ 637,862 | $ 783,749 |
Income (loss) before income taxes |  | 52,318 | 71,981 |
Income taxes (benefit) |  | 19,979 | 25,721 |
Net income | [1] | 32,339 | 46,260 |
Preferred stock dividends of subsidiaries |  | 473 | 473 |
Net income for common stock |  | 31,866 | 45,787 |
Assets |  | 11,273,447 |  | $ 11,185,142
Electric utility |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 573,442 | 720,062 |
Income (loss) before income taxes |  | 43,223 | 57,166 |
Income taxes (benefit) |  | 15,850 | 21,247 |
Net income |  | 27,373 | 35,919 |
Preferred stock dividends of subsidiaries |  | 499 | 499 |
Net income for common stock |  | 26,874 | 35,420 |
Assets |  | 5,535,500 |  | 5,590,457
Bank |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 64,348 | 63,619 |
Income (loss) before income taxes |  | 20,631 | 22,532 |
Income taxes (benefit) |  | 7,156 | 8,133 |
Net income |  | 13,475 | 14,399 |
Net income for common stock |  | 13,475 | 14,399 |
Assets |  | 5,724,877 |  | 5,566,222
Other |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 72 | 68 |
Income (loss) before income taxes |  | (11,536) | (7,717) |
Income taxes (benefit) |  | (3,027) | (3,659) |
Net income |  | (8,509) | (4,058) |
Preferred stock dividends of subsidiaries |  | (26) | (26) |
Net income for common stock |  | (8,483) | (4,032) |
Assets |  | 13,070 |  | $ 28,463
Revenues from external customers |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 637,862 | 783,749 |
Revenues from external customers | Electric utility |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 573,431 | 720,056 |
Revenues from external customers | Bank |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 64,348 | 63,619 |
Revenues from external customers | Other |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 83 | 74 |
Intersegment revenues (eliminations) | Electric utility |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | 11 | 6 |
Intersegment revenues (eliminations) | Other |  |  |  |
Segment financial information |  |  |  |
Total revenues |  | $ (11) | $ (6) |
[1] | As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”

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