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Quarterly Financial Data (Unaudited)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Data [Abstract]  
Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited)
 For the Three Months Ended
2020March 31June 30September 30December 31
Revenues$414,762 $400,646 $424,927 $443,723 
Income before income taxes$139,197 $131,710 $141,274 $156,513 
Net income $109,242 $101,066 $111,096 $125,882 
Basic earnings per share$0.73 $0.69 $0.76 $0.87 
Diluted earnings per share (1)$0.72 $0.68 $0.75 $0.86 
Effective income tax rate21.5 %23.3 %21.4 %19.6 %
 For the Three Months Ended
2019March 31June 30September 30December 31
Revenues$400,820 $409,586 $416,254 $423,225 
Income before income taxes$146,257 $162,346 $162,870 $159,968 
Net income $113,981 $126,540 $132,168 $128,737 
Basic earnings per share$0.74 $0.83 $0.88 $0.86 
Diluted earnings per share (1)$0.73 $0.82 $0.86 $0.84 
Effective income tax rate22.1 %22.1 %18.9 %19.5 %