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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income
$
91,877

 
$
114,796

 
$
85,630

Denominator:
 
 
 
 
 
Weighted-average number of common shares outstanding—basic
200,784,450

 
201,079,573

 
200,796,678

   Effect of dilutive securities:
 
 
 
 
 
Unvested restricted common stock
188,759

 
47,468

 
129,640

Shares related to unvested PSUs
548,259

 
549,217

 
533,092

Unexercised stock appreciation rights

—

 
—

 
524

Weighted-average number of common shares outstanding—diluted
201,521,468

 
201,676,258

 
201,459,934

Earnings per share:
 
 
 
 
 
Basic earnings per share
$
0.46

 
$
0.57

 
$
0.43

Diluted earnings per share
$
0.46

 
$
0.57

 
$
0.43