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Earnings Per Share
6 Months Ended
Jun. 30, 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):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 

 
 

Net income available to common stockholders
$
63,680

 
$
32,714

 
$
106,560

 
$
40,907

Denominator:
 

 
 

 
 

 
 

Basic weighted-average shares outstanding
151,983,886

 
155,603,699

 
151,725,651

 
157,335,296

Effect of dilutive shares:
 

 
 
 
 

 
 

Stock options and unvested restricted stock units
1,372,079

 
536,844

 
1,341,691

 
589,265

Diluted weighted-average shares outstanding
153,355,965

 
156,140,543

 
153,067,342

 
157,924,561

Earnings per share
 

 
 

 
 

 
 

Basic
$
0.42

 
$
0.21

 
$
0.70

 
$
0.26

Diluted
$
0.42

 
$
0.21

 
$
0.70

 
$
0.26

Antidilutive stock options and unvested restricted stock units not included in diluted earnings per share
584,405

 
3,889,923

 
916,444

 
3,862,763