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v3.3.1.900

Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating revenue | $ 87,613 | $ 82,955 | $ 72,402 | $ 62,112 | $ 69,286 | $ 125,430 | $ 70,356 | $ 54,596 | $ 305,082 | $ 319,668 | $ 276,869
Operating Income (Loss) | 31,685 | 18,260 | 17,210 | 12,805 | 15,589 | 59,114 | 12,121 | 6,054 | 79,960 | 92,878 | 53,407
Net income | 16,192 | 9,534 | 7,461 | 4,695 | 5,688 | 38,366 | 6,846 | 906 | 37,882 | 51,806 | 22,384
Comprehensive income | $ 16,368 | $ 9,422 | $ 7,206 | $ 4,680 | $ 6,021 | $ 38,095 | $ 5,716 | $ 1,104 | $ 37,676 | $ 50,936 | $ 23,461
Earnings per share |  |  |  |  |  |  |  |  |  |  |
—Basic (in dollars per share) | $ 0.79 | $ 0.47 | $ 0.37 | $ 0.23 | $ 0.28 | $ 1.90 | $ 0.34 | $ 0.04 | $ 1.86 | $ 2.56 | $ 1.13
—Diluted (in dollars per share) | 0.79 | 0.46 | 0.36 | 0.23 | 0.28 | 1.88 | 0.34 | 0.04 | $ 1.85 | $ 2.54 | $ 1.12
Dividends per share | 0.19 | 0.20 | 0.19 | 0.20 | 0.19 | 0.19 | 0.19 | 0.19 |  |  |
--- High (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | 33.68 | 31.36 | 31.68 | 35.60 | 32.87 | 28.25 | 29.51 | 30.40 |  |  |
--- Low (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | $ 27.64 | $ 27.73 | $ 28.68 | $ 30.09 | $ 26.77 | $ 25.64 | $ 25.87 | $ 27.84 |  |  |

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