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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Total operating revenues, unaffiliated customers |  |  |  |  |
Total operating revenues, unaffiliated customers | $ 83,897 | $ 86,831 | $ 204,811 | $ 233,429 |
Intersegment Revenues |  |  |  |  |
Total intersegment revenues | 1,444 | 377 | 1,957 | 757 |
Operating Income |  |  |  |  |
Total operating income | 10,455 | 7,776 | 30,528 | 32,615 |
Other income, net of expenses | 153 | 27 | 349 | 50 |
Interest charges | 2,241 | 2,114 | 4,532 | 4,265 |
Income before income taxes | 8,367 | 5,689 | 26,345 | 28,400 |
Income tax expense | 3,307 | 2,169 | 10,558 | 11,133 |
Net Income | 5,060 | 3,520 | 15,787 | 17,267 | 27,622
Total identifiable assets | 679,700 |  | 679,700 |  | 709,066
Regulated Energy [Member] |  |  |  |  |
Total operating revenues, unaffiliated customers |  |  |  |  |
Total operating revenues, unaffiliated customers | 54,330 | 54,011 | 126,348 | 138,695 |
Intersegment Revenues |  |  |  |  |
Total intersegment revenues | 1,223 | 182 | 1,501 | 368 |
Operating Income |  |  |  |  |
Total operating income | 10,505 | 7,787 | 25,303 | 24,020 |
Total identifiable assets | 572,073 |  | 572,073 |  | 565,563
Unregulated Energy [Member] |  |  |  |  |
Total operating revenues, unaffiliated customers |  |  |  |  |
Total operating revenues, unaffiliated customers | 25,176 | 29,692 | 70,063 | 88,442 |
Intersegment Revenues |  |  |  |  |
Total intersegment revenues |  |  |  |  |
Operating Income |  |  |  |  |
Total operating income | (401) | 80 | 4,753 | 8,669 |
Total identifiable assets | 70,166 |  | 70,166 |  | 107,916
Other [Member] |  |  |  |  |
Total operating revenues, unaffiliated customers |  |  |  |  |
Total operating revenues, unaffiliated customers | 4,391 | 3,128 | 8,400 | 6,292 |
Intersegment Revenues |  |  |  |  |
Total intersegment revenues | 221 | 195 | 456 | 389 |
Operating Income |  |  |  |  |
Total identifiable assets | 37,461 |  | 37,461 |  | 35,587
Other and eliminations [Member] |  |  |  |  |
Operating Income |  |  |  |  |
Total operating income | $ 351 | $ (91) | $ 472 | $ (74) |

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