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Business Segment Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 |  |
Revenues | $ 31,808 | $ 37,754 | $ 32,725 | $ 30,579 | $ 30,925 | $ 34,654 | $ 31,666 | $ 28,780 | $ 132,906 | $ 126,025 | $ 117,139
Operating Income | 7,846 | 14,156 | 10,328 | 8,302 | 8,460 | 11,460 | 9,235 | 6,685 | 40,632 | 35,840 | 34,392
Depreciation |  |  |  |  |  |  |  |  | 12,796 | 12,051 | 11,444
Other Income (Expense), Net |  |  |  |  |  |  |  |  | (862) | 293 | (403)
Interest Expense |  |  |  |  |  |  |  |  | 5,293 | 5,554 | 5,607
Income Taxes |  |  |  |  |  |  |  |  | 11,735 | 10,551 | 9,937
Net Income | 3,220 | $ 8,813 | $ 5,919 | $ 4,790 | 4,560 | $ 6,743 | $ 5,089 | $ 3,636 | 22,742 | 20,028 | 18,445
Capital Expenditures |  |  |  |  |  |  |  |  | 47,375 | 25,773 | 22,596
Assets | 620,161 |  |  |  | 581,383 |  |  |  | 620,161 | 581,383 |
Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 118,017 | 111,247 | 103,556
Operating Income |  |  |  |  |  |  |  |  | 38,201 | 33,603 | 32,000
Depreciation |  |  |  |  |  |  |  |  | 12,606 | 11,874 | 11,262
Other Income (Expense), Net |  |  |  |  |  |  |  |  | 779 | 619 | 157
Interest Expense |  |  |  |  |  |  |  |  | 5,293 | 5,554 | 5,607
Income Taxes |  |  |  |  |  |  |  |  | 11,091 | 9,522 | 8,907
Net Income |  |  |  |  |  |  |  |  | 22,353 | 18,889 | 17,249
Capital Expenditures |  |  |  |  |  |  |  |  | 47,189 | 25,706 | 22,498
Assets | 619,915 |  |  |  | 581,321 |  |  |  | 619,915 | 581,321 |
Non - Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 15,388 | 15,238 | 14,143
Operating Income |  |  |  |  |  |  |  |  | 2,431 | 2,237 | 2,392
Depreciation |  |  |  |  |  |  |  |  | 190 | 177 | 182
Other Income (Expense), Net |  |  |  |  |  |  |  |  | (1,308) | 20 | (75)
Interest Expense |  |  |  |  |  |  |  |  | 89 | 89 | 91
Income Taxes |  |  |  |  |  |  |  |  | 644 | 1,029 | 1,030
Net Income |  |  |  |  |  |  |  |  | 389 | 1,139 | 1,196
Capital Expenditures |  |  |  |  |  |  |  |  | 186 | 67 | 98
Assets | 6,245 |  |  |  | 6,436 |  |  |  | 6,245 | 6,436 |
Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (499) | (460) | (560)
Other Income (Expense), Net |  |  |  |  |  |  |  |  | (333) | (346) | (485)
Interest Expense |  |  |  |  |  |  |  |  | (89) | (89) | $ (91)
Assets | $ (5,999) |  |  |  | $ (6,374) |  |  |  | $ (5,999) | $ (6,374) |

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