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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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