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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 499,410 | $ 491,355 | $ 470,876 | $ 404,490 | $ 398,565 | $ 392,734 | $ 386,556 | $ 384,807 |  |  |
Operating costs and expenses | 466,285 | 459,864 | 439,313 | 373,780 | 368,122 | 363,522 | 357,875 | 355,390 |  |  |
Income before income taxes | 34,678 | 32,930 | 33,078 | 32,279 | 30,529 | 30,571 | 29,683 | 29,604 | $ 132,965 | $ 120,387 | $ 89,764
Net income | $ 20,186 | $ 23,472 | $ 22,551 | $ 22,017 | $ 20,299 | $ 19,711 | $ 18,760 | $ 18,626 | $ 88,226 | $ 77,396 | $ 58,024
Basic earnings per common share (in dollars per share) | $ 0.27 | $ 0.32 | $ 0.31 | $ 0.30 | $ 0.28 | $ 0.27 | $ 0.26 | $ 0.26 | $ 1.20 | $ 1.06 | $ 0.81
Diluted earnings per common share (in dollars per share) | 0.27 | 0.31 | 0.30 | 0.30 | 0.28 | 0.27 | 0.26 | 0.26 | 1.19 | 1.05 | 0.80
Cash dividends declared per common share (in shares) | $ 0.19125 | $ 0.19 | $ 0.18875 | $ 0.1875 | $ 0.18625 | $ 0.185 | $ 0.18375 | $ 0.1825 | $ 0.7575 | $ 0.7375 | $ 0.7175

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