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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Data [Abstract]  
Summary Of Quarterly Financial Data

2019

    March 31    

    June 30    

September 30

December 31

Revenue

$

1,308,217

$

1,434,231

$

1,403,697

$

1,440,224

Income from operations

$

110,161

$

120,020

$

115,621

$

98,156

Net income

$

88,132

$

91,028

$

98,582

$

72,416

Basic earnings per share

$

3.18

$

3.28

$

3.55

$

2.61

Diluted earnings per share

$

3.13

$

3.22

$

3.47

$

2.55

2018

    March 31    

    June 30    

September 30

December 31

Revenue

$

1,148,397

$

1,266,520

$

1,225,007

$

1,225,061

Income from operations

$

92,808

$

67,957

$

57,991

$

39,612

Net income

$

59,446

$

46,884

$

38,204

$

32,019

Basic earnings per share

$

2.13

$

1.69

$

1.37

$

1.15

Diluted earnings per share

$

2.13

$

1.68

$

1.36

$

1.15