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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2014 and 2013:
 
For the three months ended June 30,
 
2014
 
2013
 
Income
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net income (loss)
$
20,344

 
 
 
$
(29,384
)
 
 
Amount allocated to common stockholders (1)
91.80
%
 
 
 
100
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Income (loss) allocable to common stockholders
18,675

88,787

$
0.21

 
(29,384
)
88,597

$
(0.33
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-based compensation plans
—

565

 
 
—

—

 
Diluted EPS:
 
 
 
 
 
 
 
Income (loss) applicable to common stockholders with assumed conversion
$
18,675

89,352

$
0.21

 
$
(29,384
)
88,597

$
(0.33
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the six months ended June 30,
 
2014
 
2013
 
Income
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net income (loss)
$
240

 
 
 
$
(21,131
)
 
 
Amount allocated to common stockholders (1)
91.78
%
 
 
 
100
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Income (loss) allocable to common stockholders
220

88,752

$
0.00

 
(21,131
)
88,576

$
(0.24
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-based compensation plans
—

540

 
 
—

—

 
Diluted EPS:
 
 
 
 
 
 
 
Income (loss) applicable to common stockholders with assumed conversion
$
220

89,292

$
0.00

 
$
(21,131
)
88,576

$
(0.24
)

(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.
Securities excluded from the calculation of diluted EPS
Securities excluded from the calculation of diluted EPS:
Three months ended June 30,
Six months ended June 30,
 
2014
2013
2014
2013
 
 
 
 
 
Stock options (1)
347,433

620,334

347,433

620,334

Service-based share awards (1)
—

576,510

—

496,234

(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.