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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Data [Abstract]                      
Revenues $ 443,723 $ 424,927 $ 400,646 $ 414,762 $ 423,225 $ 416,254 $ 409,586 $ 400,820 $ 1,684,058 $ 1,649,885 $ 1,624,167
Income before income taxes 156,513 141,274 131,710 139,197 159,968 162,870 162,346 146,257 568,694 631,441 614,206
Net income $ 125,882 $ 111,096 $ 101,066 $ 109,242 $ 128,737 $ 132,168 $ 126,540 $ 113,981 $ 447,286 $ 501,426 $ 505,868
Basic earnings per common share (in USD per share) $ 0.87 $ 0.76 $ 0.69 $ 0.73 $ 0.86 $ 0.88 $ 0.83 $ 0.74 $ 3.05 $ 3.31 $ 3.23
Diluted earnings per common share (in USD per share) $ 0.86 $ 0.75 $ 0.68 $ 0.72 $ 0.84 $ 0.86 $ 0.82 $ 0.73 $ 3.00 $ 3.24 $ 3.14
Effective income tax rate 19.60% 21.40% 23.30% 21.50% 19.50% 18.90% 22.10% 22.10% 21.30% 20.60% 17.60%