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Quarterly Data - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 32,738 | $ 37,769 | $ 33,393 | $ 30,698 | $ 33,268 | $ 38,713 | $ 34,919 | $ 31,177 | $ 134,598 | $ 138,077 | $ 130,775
Operating Income | 7,559 | 11,983 | 8,950 | 7,028 | 7,153 | 12,918 | 10,721 | 6,350 | 35,520 | 37,142 | 37,798
Net Income | $ 8,071 | $ 11,119 | $ 8,146 | $ 6,552 | $ 6,993 | $ 12,290 | $ 8,675 | $ 4,494 | $ 33,888 | $ 32,452 | $ 22,809
Basic Earnings per Share | $ 0.46 | $ 0.67 | $ 0.49 | $ 0.40 | $ 0.43 | $ 0.75 | $ 0.52 | $ 0.27 | $ 2.02 | $ 1.97 | $ 1.39
Diluted Earnings per Share | 0.46 | 0.67 | 0.49 | 0.39 | 0.43 | 0.74 | 0.52 | 0.27 | 2.01 | $ 1.96 | $ 1.38
Common divident per share | 0.2563 | 0.2400 | 0.2400 | 0.2400 | 0.2400 | 0.2238 | 0.2238 | 0.2238 | $ 0.976 |  |
High common stock price | 67.69 | 66.10 | 63.68 | 60.48 | 60.31 | 49.00 | 45.24 | 41.45 |  |  |
Low common stock price | $ 58.75 | $ 55.30 | $ 52.51 | $ 51.02 | $ 43.12 | $ 41.77 | $ 34.74 | $ 33.96 |  |  |

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