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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Basic and diluted earnings (loss) per share
The following table shows the basic and diluted earnings per share for the three months ended March 31, 2013 and March 31, 2012:
 
For the three months ended March 31,
 
2013
 
2012
 
Income
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net Income (loss)
$
8,253

 
 
 
$
(4,401
)
 
 
Amount allocated to common shareholders (1)
91.69
%
 
 
 
100
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Income (loss) allocable to common shareholders
7,567

88,555

$
0.09

 
(4,401
)
88,727

$
(0.05
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
Stock compensation plans
—

465

 
 
—

—

 
Diluted EPS:
 
 
 
 
 
 
 
Income (loss) applicable to common shareholders with assumed conversion
$
7,567

89,020

$
0.09

 
$
(4,401
)
88,727

$
(0.05
)

(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.
Schedule of Antidilutive Securities Excluded from Computation of Earnings per Share
Calculation of EPS:
Three months ended March 31,
 
2013
2012
Options to purchase common stock
626,334

632,334

Weighted average service-based share awards outstanding
415,958

345,524

Excluded from the calculation of diluted EPS:
 
 
Stock options (1)
347,934

632,334

Service-based share award
—

345,524

(1)
These stock option awards were excluded from the calculation of diluted EPS because the exercise price of these options was greater than the average market price of the underlying common stock, except in periods when we had a net loss where all options were excluded because of their antidilutive effect on earnings per share.