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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Numerator for basic and diluted earnings per share -
 
 
 
 
 
 
net income attributable to common stockholders
 
$
758,250

 
$
463,595

 
$
1,012,397

 
 
 
 
 
 
 
Denominator for basic earnings per
 
 
 
 
 
 
share: weighted-average shares
 
373,620

 
367,237

 
358,275

Effect of dilutive securities:
 
 
 
 
 
 
Employee stock options
 
9

 
47

 
110

Non-vested restricted shares
 
512

 
482

 
449

Redeemable shares
 
1,096

 
1,235

 
1,393

Employee stock purchase program
 
13

 
—

 
—

Dilutive potential common shares
 
1,630

 
1,764

 
1,952

Denominator for diluted earnings per
 
 
 
 
 
 
share: adjusted-weighted average shares
 
375,250

 
369,001

 
360,227

 
 
 
 
 
 
 
Basic earnings per share
 
$
2.03

 
$
1.26

 
$
2.83

Diluted earnings per share
 
$
2.02

 
$
1.26

 
$
2.81