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Segment financial information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Segment financial information |  |  |  |  |
Total revenues | $ 623,912 | $ 798,657 | $ 1,261,774 | $ 1,582,406 |
Income (loss) before income taxes | 56,402 | 65,071 | 108,720 | 137,052 |
Income taxes (benefit) | 20,911 | 23,317 | 40,890 | 49,038 |
Net income | 35,491 | 41,754 | 67,830 | 88,014 |
Preferred stock dividends of subsidiaries | 473 | 473 | 946 | 946 |
Net income for common stock | 35,018 | 41,281 | 66,884 | 87,068 |
Assets | 11,439,631 |  | 11,439,631 |  | $ 11,185,142
Electric utility |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | 558,163 | 738,429 | 1,131,605 | 1,458,491 |
Income (loss) before income taxes | 52,451 | 55,126 | 95,674 | 112,292 |
Income taxes (benefit) | 19,111 | 20,397 | 34,961 | 41,644 |
Net income | 33,340 | 34,729 | 60,713 | 70,648 |
Preferred stock dividends of subsidiaries | 499 | 499 | 998 | 998 |
Net income for common stock | 32,841 | 34,230 | 59,715 | 69,650 |
Assets | 5,634,307 |  | 5,634,307 |  | 5,590,457
Bank |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | 65,783 | 60,616 | 130,131 | 124,235 |
Income (loss) before income taxes | 19,726 | 17,956 | 40,357 | 40,488 |
Income taxes (benefit) | 6,875 | 6,420 | 14,031 | 14,553 |
Net income | 12,851 | 11,536 | 26,326 | 25,935 |
Net income for common stock | 12,851 | 11,536 | 26,326 | 25,935 |
Assets | 5,777,098 |  | 5,777,098 |  | 5,566,222
Other |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | (34) | (388) | 38 | (320) |
Income (loss) before income taxes | (15,775) | (8,011) | (27,311) | (15,728) |
Income taxes (benefit) | (5,075) | (3,500) | (8,102) | (7,159) |
Net income | (10,700) | (4,511) | (19,209) | (8,569) |
Preferred stock dividends of subsidiaries | (26) | (26) | (52) | (52) |
Net income for common stock | (10,674) | (4,485) | (19,157) | (8,517) |
Assets | 28,226 |  | 28,226 |  | $ 28,463
Revenues from external customers |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | 623,912 | 798,657 | 1,261,774 | 1,582,406 |
Revenues from external customers | Electric utility |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | 558,156 | 738,423 | 1,131,587 | 1,458,479 |
Revenues from external customers | Bank |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | 65,783 | 60,616 | 130,131 | 124,235 |
Revenues from external customers | Other |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | (27) | (382) | 56 | (308) |
Intersegment revenues (eliminations) | Electric utility |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | 7 | 6 | 18 | 12 |
Intersegment revenues (eliminations) | Other |  |  |  |  |
Segment financial information |  |  |  |  |
Total revenues | $ (7) | $ (6) | $ (18) | $ (12) |

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