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Earnings per share
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Earnings (loss) per share
Earnings (loss) per share
Basic earnings (loss) per share ("EPS") amounts are calculated by dividing earnings available to common stockholders by the weighted average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive common shares outstanding.
Our Series A Convertible Preferred Stock has similar characteristics to a “participating security” as described by ASC 260 and we calculate the amount of earnings (loss) available to common shareholders and basic EPS using the Two-Class Method earnings allocation formula, allocating undistributed income to our preferred shareholder consistent with their participation rights, and diluted EPS using the If-Converted Method when applicable.
Our Series A Convertible Preferred Stock is a non-cumulative perpetual participating convertible preferred stock with no set dividend preferences. The holders of our convertible preferred stock do not have a contractual obligation to share in our losses.  In periods where we report net losses, we do not allocate these losses to the convertible preferred stock for the computation of basic or diluted EPS.
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:
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.