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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following is a reconciliation of the calculation of basic and diluted earnings per share (in thousands, except share and per-share data):
 
Years Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income attributable to common stockholders
$
87,784

 
$
91,877

 
$
114,796

Denominator:
 
 
 
 
 
Weighted-average number of common shares outstanding—basic
205,462,911

 
200,784,450

 
201,079,573

   Effect of dilutive securities:
 
 
 
 
 
Unvested restricted common stock
215,655

 
188,759

 
47,468

Shares related to unvested PSUs
452,584

 
548,259

 
549,217

Weighted-average number of common shares outstanding—diluted
206,131,150

 
201,521,468

 
201,676,258

Earnings per share:
 
 
 
 
 
Net income per share available to common stockholders—basic
$
0.43

 
$
0.46

 
$
0.57

Net income per share available to common stockholders—diluted
$
0.43

 
$
0.46

 
$
0.57