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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Basic and diluted earnings (loss) per share
The following table shows the basic and diluted earnings (loss) per share for 2014, 2013, and 2012:
 
For the year ended December 31, 2014
 
Net income
Shares (000)
Per-Share
Net income
$
112,494

 
 
Amount allocated to common stockholders
91.81
%
 
 
Basic EPS:
 

 
 
Net income allocated to common stockholders
103,283

88,823

$
1.16

Effect of Dilutive Securities:
 

 

 

Share-based compensation plans
 
605

 

Diluted EPS:
 

 

 

Net income allocated to common stockholders with assumed conversion
$
103,283

89,428

$
1.15

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

 
Amount allocated to common stockholders (1)
100.00
%
 

 
Basic and Diluted EPS:
 

 

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

$
(0.45
)

 
For the year ended December 31, 2012
 
Net loss
Shares (000)
Per-Share
Net loss
$
(35,610
)
 

 
Amount allocated to common stockholders (1)
100.00
%
 

 
Basic and Diluted EPS:
 

 

 
Net loss allocated to common stockholders
$
(35,610
)
88,534

$
(0.40
)

(1)
We have not allocated net losses between common and preferred stockholders, as the holders of our preferred shares do not have a contractual obligation to share in the loss.
Antidilutive securities excluded from calculation of diluted EPS
Securities excluded from the calculation of diluted EPS:
 
 
 
 
2014
2013
2012
Stock options (1)
320,553

619,833

626,334

Service-based share awards (1)
—

442,737

396,133

 
(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.