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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2013
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 nine months ended September 30, 2013 and September 30, 2012:
 
For the three months ended September 30,
 
2013
 
2012
 
Loss
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net loss
$
(9,507
)
 
 
 
$
(12,023
)
 
 
Amount allocated to common shareholders (1)
100
%
 
 
 
100
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Loss allocable to common shareholders
(9,507
)
88,611

$
(0.11
)
 
(12,023
)
88,468

$
(0.14
)
Diluted EPS:
 
 
 
 
 
 
 
Loss applicable to common shareholders with assumed conversion
$
(9,507
)
88,611

$
(0.11
)
 
$
(12,023
)
88,468

$
(0.14
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the nine months ended September 30,
 
2013
 
2012
 
Loss
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net loss
$
(30,638
)
 
 
 
$
(28,701
)
 
 
Amount allocated to common shareholders (1)
100
%
 
 
 
100
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Loss allocable to common shareholders
(30,638
)
88,588

$
(0.35
)
 
(28,701
)
88,549

$
(0.32
)
Diluted EPS:
 
 
 
 
 
 
 
Loss applicable to common shareholders with assumed conversion
$
(30,638
)
88,588

$
(0.35
)
 
$
(28,701
)
88,549

$
(0.32
)

(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
Antidilutive securities excluded from the calculation of diluted EPS:
Three months ended September 30,
Nine months ended September 30,
 
2013
2012
2013
2012
 
 
 
 
 
Stock options (1)
620,334

626,334

620,334

626,334

Service-based share awards (1)
573,628

406,070

522,032

382,462

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