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Earnings per share (Tables)
 3 Months Ended
Mar. 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 the three months ended March 31, 2014 and 2013:
 
For the three months ended March 31,
 
2014
 
2013
 
Loss
Shares (000)
Per-Share
 
Income
Shares (000)
Per-Share
Net income (loss)
$
(20,104
)
 
 
 
$
8,253

 
 
Amount allocated to common shareholders (1)
100
%
 
 
 
91.69
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Income (loss) allocable to common shareholders
(20,104
)
88,717

$
(0.23
)
 
7,567

88,555

$
0.09

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-based compensation plans
—

—

 
 
—

465

 
Diluted EPS:
 
 
 
 
 
 
 
Income (loss) applicable to common shareholders with assumed conversion
$
(20,104
)
88,717

$
(0.23
)
 
$
7,567

89,020

$
0.09


(1)
We have not allocated net losses between common and preferred shareholders, as the holders of our preferred shares do not have a contractual obligation to share in the loss.
Antidilutive securities excluded from the calculation of diluted EPS
Antidilutive securities excluded from the calculation of diluted EPS:
Three months ended March 31,
 
2014
2013
 
 
 
Stock options (1)
603,032

347,934

Service-based share awards (1)
442,456

—

(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.