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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | $ 109,516 | $ 78,175 | $ 83,897 | $ 120,914 | $ 103,988 | $ 80,610 | $ 86,831 | $ 146,597 | $ 392,502 | $ 418,027 | $ 427,546
Intersegment Revenues |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  | 5,112 | 2,161 | 2,323
Operating Income |  |  |  |  |  |  |  |  |  |  |
Operating Income | 18,543 | 7,564 | 10,455 | 20,073 | 15,495 | 5,594 | 7,776 | 24,839 | 56,635 | 53,705 | 51,930
Other income |  |  |  |  |  |  |  |  | 271 | 906 | 195
Interest charges |  |  |  |  |  |  |  |  | 8,747 | 9,000 | 9,146
Income Before Income taxes |  |  |  |  |  |  |  |  | 48,159 | 45,611 | 42,979
Income taxes |  |  |  |  |  |  |  |  | 19,296 | 17,989 | 16,923
Net Income | 9,857 | 3,219 | 5,060 | 10,727 | 7,957 | 2,397 | 3,520 | 13,747 | 28,863 | 27,622 | 26,056
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 22,510 | 20,153 | 18,536
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 78,210 | 44,431 | 46,955
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets | 733,746 |  |  |  | 709,066 |  |  |  | 733,746 | 709,066 |
Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  |  |  |  |  |  |  |  | 245,042 | 255,405 | 268,830
Intersegment Revenues |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  | 1,166 | 1,368 | 1,104
Operating Income |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 46,999 | 43,911 | 43,267
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 18,653 | 16,512 | 14,680
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 69,056 | 37,104 | 41,898
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets | 615,438 |  |  |  | 565,563 |  |  |  | 615,438 | 565,563 |
Unregulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  |  |  |  |  |  |  |  | 130,020 | 149,586 | 146,430
Intersegment Revenues |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  | 3,029 |  | 363
Operating Income |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 8,355 | 9,619 | 8,150
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 3,420 | 3,229 | 3,569
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 3,969 | 2,432 | 2,764
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets | 79,287 |  |  |  | 107,916 |  |  |  | 79,287 | 107,916 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  |  |  |  |  |  |  |  | 17,440 | 13,036 | 12,286
Intersegment Revenues |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  | 917 | 793 | 856
Operating Income |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 1,281 | 175 | 513
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 5,185 | 4,895 | 2,293
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets | 39,021 |  |  |  | 35,587 |  |  |  | 39,021 | 35,587 |
Other and eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | $ 437 | $ 412 | $ 287

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