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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 405,057 | $ 408,682 | $ 404,830 | $ 405,598 | $ 408,219 | $ 386,018 | $ 372,331 | $ 359,984 | $ 1,624,167 | $ 1,526,552 | $ 1,401,545
Income before income taxes | 143,599 | 157,595 | 154,254 | 158,758 | 152,452 | 140,769 | 135,158 | 128,660 | $ 614,206 | $ 557,039 | $ 508,485
Net income | $ 116,034 | $ 128,319 | $ 121,677 | $ 139,838 | $ 122,144 | $ 101,739 | $ 91,769 | $ 88,737 |  |  |
Basic earnings per common share (in USD per share) | $ 0.75 | $ 0.82 | $ 0.77 | $ 0.89 | $ 0.78 | $ 0.64 | $ 0.58 | $ 0.56 | $ 3.23 | $ 2.56 | $ 2.07
Diluted earnings per common share (in USD per share) | $ 0.73 | $ 0.80 | $ 0.75 | $ 0.86 | $ 0.75 | $ 0.63 | $ 0.57 | $ 0.55 | $ 3.14 | $ 2.49 | $ 2.03
Effective income tax rate | 19.20% | 18.60% | 21.10% | 11.90% | 19.90% | 27.70% | 32.10% | 31.00% | 17.60% | 27.40% | 34.30%
Net tax benefit from enactment of the Tax Act |  |  |  |  | $ 12,410 |  |  |  |  |  |
Net tax benefit from enactment of the Tax Act, per diluted share |  |  |  |  | $ 0.08 |  |  |  |  |  |

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