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Earnings Per Share
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share  
The following table sets forth the components used in the computation of basic and diluted earnings per share (in thousands, except share and per share amounts):
 
 
Year Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 

 
 

 
 

Income available to common stockholders
$
269,911

 
$
187,191

 
$
195,171

Denominator:
 

 
 

 
 

Basic weighted-average shares outstanding
148,183,431

 
154,134,411

 
160,859,782

Effect of dilutive shares:
 
 
 
 
 
Stock options and unvested restricted stock units
821,259

 
950,955

 
521,717

Diluted weighted-average shares outstanding
149,004,690

 
155,085,366

 
161,381,499

Earnings per share
 

 
 

 
 

Basic
$
1.82

 
$
1.21

 
$
1.21

Diluted
$
1.81

 
$
1.21

 
$
1.21

Antidilutive stock options not included in diluted earnings per share
1,645,816

 
3,288,340

 
4,551,337