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Earnings (loss) per share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Basic and diluted earnings (loss) per share
The following table shows the basic and diluted earnings (loss) per share for 2015, 2014, and 2013:
 
For the year ended December 31, 2015
 
Net loss
Shares (000)
Per-Share
Net loss
$
(59,310
)
 
 
Amount allocated to common stockholders
100.00
%
 
 
Basic and Diluted EPS:
 

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

$
(0.68
)
 
For the year ended December 31, 2014
 
Net income
Shares (000)
Per-Share
Net income
$
126,474

 

 
Amount allocated to common stockholders
91.81
%
 

 
Basic EPS:
 

 

 
Net income allocated to common stockholders
116,118

88,823

$
1.31

Effect of Dilutive Securities:
 
 
 
Share-based compensation plans
 
605

 
Diluted EPS:
$
116,118

89,428

$
1.30


 
For the year ended December 31, 2013
 
Net loss
Shares (000)
Per-Share
Net loss
$
(40,313
)
 

 
Amount allocated to common stockholders
100.00
%
 

 
Basic and Diluted EPS:
 

 

 
Net loss allocated to common stockholders
$
(40,313
)
88,612

$
(0.45
)
Antidilutive securities excluded from calculation of diluted EPS
Securities excluded from the calculation of diluted EPS:
 
 
 
 
2015
2014
2013
Stock options (1)
356,634

320,553

619,833

Service-based share awards (1)
608,914

—

442,737

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