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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of earnings (loss) 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):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income
$
44,175

 
$
24,822

 
$
60,953

 
$
35,464

Denominator:
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding—basic
201,273,767

 
200,830,064

 
201,133,321

 
200,738,301

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested restricted common stock
—

 
80,538

 
81,513

 
143,882

Unexercised stock appreciation rights
—

 
1,425

 
—

 
2,212

Shares related to unvested PSUs
553,617

 
230,720

 
553,617

 
230,720

Weighted-average number of common shares outstanding—diluted
201,827,384

 
201,142,747

 
201,768,451

 
201,115,115

Earnings per share:


 
 
 


 


Basic earnings per share
$
0.22

 
$
0.12

 
$
0.30

 
$
0.18

Diluted earnings per share
$
0.22

 
$
0.12

 
$
0.30

 
$
0.18