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Business Segment Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 N | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 |  |
Operating Revenues | $ 27,421 | $ 31,285 | $ 29,102 | $ 27,038 | $ 27,079 | $ 32,353 | $ 27,401 | $ 23,546 | $ 114,846 | $ 110,379 | $ 102,069
Operating Income | 6,664 | 10,270 | 8,171 | 5,865 | 5,717 | 10,843 | 7,210 | 3,877 | 30,970 | 27,647 | 24,201
Depreciation |  |  |  |  |  |  |  |  | 10,988 | 10,409 | 9,746
Total Other Income, net |  |  |  |  |  |  |  |  | 91 | 857 | 2,149
Interest Charges |  |  |  |  |  |  |  |  | 5,807 | 6,725 | 6,376
Income Taxes |  |  |  |  |  |  |  |  | 8,621 | 7,383 | 6,527
Net Income | 3,168 | 5,807 | 4,481 | 3,177 | 2,726 | 6,138 | 3,725 | 1,807 | 16,633 | 14,396 | 13,447
Capital Expenditures |  |  |  |  |  |  |  |  | 20,080 | 21,578 | 23,562
Assets | 530,341 |  |  |  | 561,726 |  |  |  | 530,341 | 561,726 |
Regulated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 100,910 | 98,021 | 91,729
Operating Income |  |  |  |  |  |  |  |  | 28,744 | 25,944 | 22,760
Depreciation |  |  |  |  |  |  |  |  | 10,807 | 10,241 | 9,601
Total Other Income, net |  |  |  |  |  |  |  |  | 828 | 1,489 | 1,982
Interest Charges |  |  |  |  |  |  |  |  | 5,807 | 6,725 | 6,376
Income Taxes |  |  |  |  |  |  |  |  | 7,635 | 6,579 | 5,548
Net Income |  |  |  |  |  |  |  |  | 15,504 | 13,500 | 12,088
Capital Expenditures |  |  |  |  |  |  |  |  | 19,894 | 21,149 | 23,125
Assets | 529,381 |  |  |  | 560,165 |  |  |  | 529,381 | 560,165 |
Non - Regulated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 14,463 | 12,851 | 10,805
Operating Income |  |  |  |  |  |  |  |  | 2,226 | 1,703 | 1,441
Depreciation |  |  |  |  |  |  |  |  | 181 | 168 | 145
Total Other Income, net |  |  |  |  |  |  |  |  | (14) | 94 | 896
Interest Charges |  |  |  |  |  |  |  |  | 97 | 96 | 97
Income Taxes |  |  |  |  |  |  |  |  | 986 | 804 | 979
Net Income |  |  |  |  |  |  |  |  | 1,129 | 896 | 1,359
Capital Expenditures |  |  |  |  |  |  |  |  | 186 | 429 | 437
Assets | 8,887 |  |  |  | 11,674 |  |  |  | 8,887 | 11,674 |
Inter-segment Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | (527) | (493) | (465)
Total Other Income, net |  |  |  |  |  |  |  |  | (723) | (726) | (729)
Interest Charges |  |  |  |  |  |  |  |  | (97) | (96) | (97)
Assets | $ (7,927) |  |  |  | $ (10,113) |  |  |  | $ (7,927) | $ (10,113) |

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