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Business Segment Data (Details) (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 N | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 |  |
Operating Revenues | $ 27,079 | $ 32,353 | $ 27,401 | $ 23,546 | $ 23,300 | $ 28,671 | $ 26,102 | $ 23,996 | $ 110,379 | $ 102,069 | $ 102,735
Operating Income | 5,717 | 10,843 | 7,210 | 3,877 | 4,179 | 8,516 | 6,738 | 4,768 | 27,647 | 24,201 | 26,597
Depreciation |  |  |  |  |  |  |  |  | 10,409 | 9,746 | 9,244
Total Other Income, net |  |  |  |  |  |  |  |  | 857 | 2,149 | 1,444
Interest Charges |  |  |  |  |  |  |  |  | 6,725 | 6,376 | 6,925
Income Taxes |  |  |  |  |  |  |  |  | 7,383 | 6,527 | 6,786
Net Income | 2,726 | 6,138 | 3,725 | 1,807 | 2,049 | 5,143 | 3,625 | 2,630 | 14,396 | 13,447 | 14,330
Capital Expenditures |  |  |  |  |  |  |  |  | 21,578 | 23,562 | 29,604
Assets | 561,726 |  |  |  | 537,536 |  |  |  | 561,726 | 537,536 |
Regulated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 98,021 | 91,729 | 92,378
Operating Income |  |  |  |  |  |  |  |  | 25,944 | 22,760 | 24,815
Depreciation |  |  |  |  |  |  |  |  | 10,241 | 9,601 | 9,093
Total Other Income, net |  |  |  |  |  |  |  |  | 1,489 | 1,982 | 1,265
Interest Charges |  |  |  |  |  |  |  |  | 6,725 | 6,376 | 6,925
Income Taxes |  |  |  |  |  |  |  |  | 6,579 | 5,548 | 6,004
Net Income |  |  |  |  |  |  |  |  | 13,500 | 12,088 | 13,152
Capital Expenditures |  |  |  |  |  |  |  |  | 21,149 | 23,125 | 29,344
Assets | 560,165 |  |  |  | 539,947 |  |  |  | 560,165 | 539,947 |
Non - Regulated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 12,851 | 10,805 | 10,937
Operating Income |  |  |  |  |  |  |  |  | 1,703 | 1,441 | 1,782
Depreciation |  |  |  |  |  |  |  |  | 168 | 145 | 151
Total Other Income, net |  |  |  |  |  |  |  |  | 94 | 896 | 313
Interest Charges |  |  |  |  |  |  |  |  | 96 | 97 | 134
Income Taxes |  |  |  |  |  |  |  |  | 804 | 979 | 782
Net Income |  |  |  |  |  |  |  |  | 896 | 1,359 | 1,178
Capital Expenditures |  |  |  |  |  |  |  |  | 429 | 437 | 260
Assets | 11,674 |  |  |  | 10,325 |  |  |  | 11,674 | 10,325 |
Inter-segment Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | (493) | (465) | (580)
Total Other Income, net |  |  |  |  |  |  |  |  | (726) | (729) | (134)
Interest Charges |  |  |  |  |  |  |  |  | (96) | (97) | (134)
Assets | $ (10,113) |  |  |  | $ (12,736) |  |  |  | $ (10,113) | $ (12,736) |

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