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Segment financial information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 3,242,335 | $ 2,664,982 | $ 2,309,590
Total revenues | 851,028 | 886,355 | 794,319 | 710,633 | 695,737 | 694,541 | 655,664 | 619,040 | 3,242,335 | 2,664,982 | 2,309,590
Depreciation and amortization |  |  |  |  |  |  |  |  | 167,470 | 159,128 | 156,671
Interest expenses |  |  |  |  |  |  |  |  | 96,575 | 101,887 | 119,873
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 216,052 | 183,247 | 128,824
Income taxes (benefit) |  |  |  |  |  |  |  |  | 75,932 | 67,822 | 43,923
Net income |  |  |  |  |  |  |  |  | 140,120 | 115,425 | 84,901
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 1,890 | 1,890 | 1,890
Net income for common stock | 34,225 | 48,404 | 27,139 | 28,462 | 24,698 | 32,449 | 29,262 | 27,126 | 138,230 | 113,535 | 83,011
Capital expenditures |  |  |  |  |  |  |  |  | 235,116 | 182,125 | 288,879
Tangible assets at the end of the period | 9,502,314 |  |  |  | 8,996,455 |  |  |  | 9,502,314 | 8,996,455 | 8,838,612
Electric utility |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 2,978,547 | 2,382,211 | 2,034,834
Intersegment revenues (eliminations) |  |  |  |  |  |  |  |  | 143 | 155 | 175
Total revenues |  |  |  |  |  |  |  |  | 2,978,690 | 2,382,366 | 2,035,009
Depreciation and amortization |  |  |  |  |  |  |  |  | 160,353 | 157,432 | 154,578
Interest expenses |  |  |  |  |  |  |  |  | 60,031 | 61,510 | 57,944
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 163,565 | 125,452 | 129,217
Income taxes (benefit) |  |  |  |  |  |  |  |  | 61,584 | 46,868 | 47,776
Net income |  |  |  |  |  |  |  |  | 101,981 | 78,584 | 81,441
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 1,995 | 1,995 | 1,995
Net income for common stock |  |  |  |  |  |  |  |  | 99,986 | 76,589 | 79,446
Capital expenditures |  |  |  |  |  |  |  |  | 226,022 | 174,344 | 286,445
Tangible assets at the end of the period | 4,671,942 |  |  |  | 4,285,680 |  |  |  | 4,671,942 | 4,285,680 | 3,978,392
Bank |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 264,407 | 282,693 | 274,719
Total revenues |  |  |  |  |  |  |  |  | 264,407 | 282,693 | 274,719
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,909 | 749 | 1,309
Interest expenses |  |  |  |  |  |  |  |  | 14,469 | 20,349 | 43,543
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 91,536 | 92,512 | 31,705
Income taxes (benefit) |  |  |  |  |  |  |  |  | 31,693 | 34,056 | 9,938
Net income |  |  |  |  |  |  |  |  | 59,843 | 58,456 | 21,767
Net income for common stock |  |  |  |  |  |  |  |  | 59,843 | 58,456 | 21,767
Capital expenditures |  |  |  |  |  |  |  |  | 8,984 | 7,709 | 2,188
Tangible assets at the end of the period | 4,819,557 |  |  |  | 4,707,870 |  |  |  | 4,819,557 | 4,707,870 | 4,854,595
Other |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | (619) | 78 | 37
Intersegment revenues (eliminations) |  |  |  |  |  |  |  |  | (143) | (155) | (175)
Total revenues |  |  |  |  |  |  |  |  | (762) | (77) | (138)
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,208 | 947 | 784
Interest expenses |  |  |  |  |  |  |  |  | 22,075 | 20,028 | 18,386
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (39,049) | (34,717) | (32,098)
Income taxes (benefit) |  |  |  |  |  |  |  |  | (17,345) | (13,102) | (13,791)
Net income |  |  |  |  |  |  |  |  | (21,704) | (21,615) | (18,307)
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | (105) | (105) | (105)
Net income for common stock |  |  |  |  |  |  |  |  | (21,599) | (21,510) | (18,202)
Capital expenditures |  |  |  |  |  |  |  |  | 110 | 72 | 246
Tangible assets at the end of the period | $ 10,815 |  |  |  | $ 2,905 |  |  |  | $ 10,815 | $ 2,905 | $ 5,625

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