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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Data [Abstract]  
Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited)
 
 
For the Three Months Ended
2019
 
March 31
 
June 30
 
September 30
 
December 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 rate
 
22.1
%
 
22.1
%
 
18.9
%
 
19.5
%
(1) The sum of the individual quarterly earnings per share amounts may not agree with the annual earnings per share amount as each quarterly computation is based on the weighted average number of shares outstanding during that period.
 
 
For the Three Months Ended
2018
 
March 31
 
June 30
 
September 30
 
December 31
Revenues
 
$
405,598

 
$
404,830

 
$
408,682

 
$
405,057

Income before income taxes
 
$
158,758

 
$
154,254

 
$
157,595

 
$
143,599

Net income
 
$
139,838

 
$
121,677

 
$
128,319

 
$
116,034

Basic earnings per share
 
$
0.89

 
$
0.77

 
$
0.82

 
$
0.75

Diluted earnings per share
 
$
0.86

 
$
0.75

 
$
0.80

 
$
0.73

 
 
 
 
 
 
 
 
 
Effective income tax rate
 
11.9
%
 
21.1
%
 
18.6
%
 
19.2
%