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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of earnings per share The following table sets forth the computation of basic and diluted earnings per share (shares in thousands): 
 
Year Ended December 31, 
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
Net income available to common stockholders
$
1,174

 
$
1,096

 
$
1,346

Denominator:
 
 
 
 
 
Denominator for basic earnings per share—weighted-average common shares
77,341

 
82,652

 
84,599

Effect of dilutive securities:
 
 
 
 
 
Employee stock options
114

 
379

 
403

Restricted stock units
255

 
499

 
560

Denominator for diluted earnings per share—adjusted weighted-average common shares
77,710

 
83,530

 
85,562

Basic earnings per share
$
15.18

 
$
13.26

 
$
15.91

Diluted earnings per share
$
15.11

 
$
13.12

 
$
15.73