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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
OPERATING REVENUE | $ 155,789 | $ 162,282 | $ 160,873 | $ 166,318 | $ 167,227 | $ 147,908 | $ 142,144 | $ 139,536 | $ 645,262 | $ 596,815 | $ 610,803
Operating Income (Loss) | 23,765 | 27,339 | 24,989 | 17,326 | 17,663 | 26,739 | 29,030 | 20,843 | 93,419 | 94,275 | 89,787
Income before income taxes | 23,902 | 27,510 | 25,146 | 17,703 | 17,516 | 27,415 | 30,259 | 21,988 | 94,261 | 97,178 | 91,917
Net income | $ 17,672 | $ 20,714 | $ 19,182 | $ 13,238 | $ 12,787 | $ 20,501 | $ 22,361 | $ 17,318 | $ 70,806 | $ 72,967 | $ 72,677
Earnings Per Share Basic | $ 0.22 | $ 0.25 | $ 0.24 | $ 0.16 | $ 0.16 | $ 0.25 | $ 0.27 | $ 0.21 | $ 0.87 | $ 0.89 | $ 0.88
Earnings Per Share Diluted | $ 0.22 | $ 0.25 | $ 0.24 | $ 0.16 | $ 0.16 | $ 0.25 | $ 0.27 | $ 0.21 | $ 0.87 | $ 0.89 | $ 0.88

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