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Selected Quarterly Financial Data (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 366,082 | $ 360,165 | $ 355,356 | $ 355,246 | $ 341,624 | $ 320,099 | $ 319,295 | $ 312,165 |  |  |
Operating costs and expenses | 355,667 | 332,090 | 329,341 | 330,699 | 320,499 | 355,132 | 298,055 | 289,417 |  |  |
Income before income taxes | 11,712 | 26,741 | 26,257 | 25,054 | 21,619 | (35,083) | 22,043 | 23,129 | $ 89,764 | $ 31,708 | $ 66,489
Net income | $ 9,134 | $ 17,086 | $ 16,288 | $ 15,516 | $ 15,472 | $ (22,182) | $ 13,921 | $ 14,639 | $ 58,024 | $ 21,850 | $ 47,129
Basic earnings per common share (in dollars per share) | $ 0.13 | $ 0.24 | $ 0.23 | $ 0.22 | $ 0.22 | $ (0.31) | $ 0.20 | $ 0.21 | $ 0.81 | $ 0.31 | $ 0.68
Diluted earnings per common share (in dollars per share) | 0.13 | 0.24 | 0.23 | 0.22 | 0.22 | (0.31) | 0.20 | 0.21 | $ 0.80 | $ 0.31 | $ 0.67
Cash dividends per common share (in dollars per share) | $ 0.18000 | $ 0.17875 | $ 0.1775 | $ 0.17625 | $ 0.175 | $ 0.17375 | $ 0.17250 | $ 0.17125 |  |  |

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