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Earnings (loss) per share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Basic and diluted earnings (loss) per share
The following table shows the basic and diluted earnings (loss) per share for 2017, 2016, and 2015:
 
For the year ended December 31, 2017
 
Net income
 
Shares (000)
 
Per Share
Net income
$
48,580

 
 
 
 
Amount allocated to common stockholders
92
%
 
 

 
 
Basic EPS:
 

 
 

 
 
Net income allocated to common stockholders
$
44,714

 
87,295

 
$
0.51

Effect of dilutive securities:
 
 
 
 
 
Stock options
 
 
101

 
 
Service-based share awards
 
 
624

 
 
Diluted EPS:
$
44,714

 
88,020

 
$
0.51


 
For the year ended December 31, 2016
 
Net loss
 
Shares (000)
 
Per Share
Net loss
$
(252,415
)
 
 

 
 
Amount allocated to common stockholders
100
%
 
 

 
 
Basic and Diluted EPS:
 

 
 

 
 
Net loss allocated to common stockholders
$
(252,415
)
 
87,064

 
$
(2.90
)

 
For the year ended December 31, 2015
 
Net income
 
Shares (000)
 
Per Share
Net loss
$
(59,310
)
 
 

 
 
Amount allocated to common stockholders
100
%
 
 

 
 
Basic and Diluted EPS:
 

 
 

 
 
Net loss allocated to common stockholders
$
(59,310
)
 
87,375

 
$
(0.68
)
Schedule of Antidilutive securities excluded from calculation of diluted EPS
Securities excluded from the calculation of diluted EPS:
2017
 
2016
 
2015
Stock options (1)
83,083

 
105,453

 
356,634

Service-based share awards (1)
496,036

 
840,402

 
608,914

 
(1) 
In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on earnings (loss) per share.