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Electric utility subsidiary (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2011 Cumulative Preferred Stock $20 Par Value | Dec. 31, 2011 Cumulative Preferred Stock $100 Par Value | Dec. 31, 2011 Electric utility | Dec. 31, 2010 Electric utility | Dec. 31, 2009 Electric utility | Dec. 31, 2011 Electric utility Minimum | Dec. 31, 2011 Electric utility Maximum
Utility plant, at cost |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | $ 5,103,541 | $ 4,948,338 |  |  |
Less accumulated depreciation |  |  |  |  |  |  | (1,966,894) | (1,941,059) |  |  |
Construction in progress |  |  |  |  |  |  | 138,838 | 101,562 |  |  |
Net utility plant |  |  |  |  |  |  | 3,275,485 | 3,108,841 |  |  |
Regulatory assets | 669,389 | 478,330 |  |  |  |  | 669,389 | 478,330 |  |  |
Other |  |  |  |  |  |  | 727,068 | 698,509 |  |  |
Total assets | 9,592,731 | 9,085,344 |  |  |  |  | 4,671,942 | 4,285,680 |  |  |
Capitalization and liabilities |  |  |  |  |  |  |  |  |  |  |
Common stock ($6 2/3 par value, authorized 50,000,000 shares, outstanding 13,830,823 shares and 13,786,959 shares in 2010 and 2009, respectively) |  |  |  |  |  |  | 94,911 | 92,224 |  |  |
Premium on capital stock |  |  |  |  |  |  | 426,921 | 389,609 |  |  |
Retained earnings | 201,640 | 181,910 |  |  |  |  | 884,284 | 854,856 |  |  |
Accumulated other comprehensive income (loss), net of income taxes | (19,137) | (12,472) |  |  |  |  | (32) | 709 |  |  |
Total shareholders' equity | 1,531,949 | 1,483,637 | 1,441,648 | 1,389,454 |  |  | 1,406,084 | 1,337,398 |  |  |
Cumulative preferred stock - not subject to mandatory redemption |  |  |  |  |  |  | 34,293 | 34,293 |  |  |
Long-term debt, net |  | 1,364,942 |  |  |  |  | 1,000,570 | 1,057,942 |  |  |
Total capitalization |  |  |  |  |  |  | 2,440,947 | 2,429,633 |  |  |
Current portion of long-term debt |  |  |  |  |  |  | 57,500 |  |  |  |
Deferred income taxes | 354,051 | 278,958 |  |  |  |  | 337,863 | 269,286 |  |  |
Regulatory liabilities | 315,466 | 296,797 |  |  |  |  | 315,466 | 296,797 |  |  |
Contributions in aid of construction | 356,203 | 335,364 |  |  |  |  | 356,203 | 335,364 |  |  |
Other | 516,990 | 446,485 |  |  |  |  | 1,163,963 | 954,600 |  |  |
Total liabilities and shareholders' equity | $ 9,592,731 | $ 9,085,344 |  |  |  |  | $ 4,671,942 | $ 4,285,680 |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  | $ 6.667 | $ 6.667 | $ 6.667 |  |
Common stock, authorized shares | 200,000,000 | 200,000,000 |  |  |  |  | 50,000,000 | 50,000,000 | 50,000,000 |  |
Common stock, outstanding shares | 96,038,328 | 94,690,932 |  |  |  |  | 14,233,723 | 13,830,823 | 13,786,959 |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  |
Cumulative preferred stock, par value (in dollars per share) |  |  |  |  | $ 20 | $ 100 | $ 100 | $ 100 |  |  |
Preferred stock, authorized shares | 10,000,000 | 10,000,000 |  |  | 5,000,000 | 7,000,000 | 7,000,000 | 7,000,000 |  |  |
Cumulative preferred stock, outstanding shares |  |  |  |  | 1,114,657 | 120,000 | 120,000 | 120,000 |  |  |
Preferred stock, Dividend Rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.25% | 7.625%

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