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Quarterly Financial Information (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 (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
OPERATING REVENUE | $ 167,227 | $ 147,908 | $ 142,144 | $ 139,536 | $ 147,003 | $ 151,279 | $ 155,826 | $ 156,695 | $ 596,815 | $ 610,803 | $ 607,336
Operating Income (Loss) | 17,663 | 26,739 | 29,030 | 20,843 | 29,560 | 25,132 | 22,147 | 12,948 | 94,275 | 89,787 | 63,544
Income before income taxes | 17,516 | 27,415 | 30,259 | 21,988 | 30,339 | 25,718 | 22,570 | 13,290 | 97,178 | 91,917 | 64,498
Net income | $ 12,787 | $ 20,501 | $ 22,361 | $ 17,318 | $ 22,440 | $ 19,056 | $ 17,803 | $ 13,378 | $ 72,967 | $ 72,677 | $ 75,173
Earnings Per Share Basic | $ 0.16 | $ 0.25 | $ 0.27 | $ 0.21 | $ 0.27 | $ 0.23 | $ 0.22 | $ 0.16 | $ 0.89 | $ 0.88 | $ 0.9
Earnings Per Share Diluted | $ 0.16 | $ 0.25 | $ 0.27 | $ 0.21 | $ 0.27 | $ 0.23 | $ 0.22 | $ 0.16 | $ 0.89 | $ 0.88 | $ 0.9

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