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Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating revenue | $ 79,306 | $ 112,344 | $ 86,944 | $ 61,112 | $ 87,613 | $ 82,955 | $ 72,402 | $ 62,112 | $ 339,706 | $ 305,082 | $ 319,668
Operating Income (Loss) | 16,389 | 36,346 | 29,800 | 10,581 | 31,685 | 18,260 | 17,210 | 12,805 | 93,116 | 79,960 | 92,878
Net income | 13,727 | 18,959 | 16,775 | 3,378 | 16,192 | 9,534 | 7,461 | 4,695 | 52,839 | 37,882 | 51,806
Comprehensive income | $ 13,834 | $ 18,790 | $ 15,520 | $ 3,908 | $ 16,368 | $ 9,422 | $ 7,206 | $ 4,680 | $ 52,052 | $ 37,676 | $ 50,936
Earnings per share |  |  |  |  |  |  |  |  |  |  |
—Basic (in dollars per share) | $ 0.67 | $ 0.93 | $ 0.82 | $ 0.17 | $ 0.79 | $ 0.47 | $ 0.37 | $ 0.23 | $ 2.59 | $ 1.86 | $ 2.56
—Diluted (in dollars per share) | 0.67 | 0.92 | 0.82 | 0.16 | 0.79 | 0.46 | 0.36 | 0.23 | $ 2.57 | $ 1.85 | $ 2.54
Dividends per share | 0.20 | 0.20 | 0.20 | 0.20 | 0.19 | 0.20 | 0.19 | 0.20 |  |  |
--- High (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | 56.69 | 46.66 | 39.38 | 37.50 | 33.68 | 31.36 | 31.68 | 35.60 |  |  |
--- Low (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | $ 42.19 | $ 38.13 | $ 32.66 | $ 29.35 | $ 27.64 | $ 27.73 | $ 28.68 | $ 30.09 |  |  |

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