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Earnings (loss) per share (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 and 2015:
 
For the three months ended June 30,
 
2016
 
2015
 
Loss
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net loss
$
(9,515
)
 
 
 
$
(33,897
)
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
100.00
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Net loss allocated to common stockholders
(9,515
)
87,060

$
(0.11
)
 
(33,897
)
86,873

$
(0.39
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-based compensation plans
—

—

 
 
—

—

 
Diluted EPS:
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(9,515
)
87,060

$
(0.11
)
 
$
(33,897
)
86,873

$
(0.39
)


 
For the six months ended June 30,
 
2016
 
2015
 
Loss
Shares (000)
Per-Share
 
Income
Shares (000)
Per-Share
Net income (loss)
$
(25,678
)
 
 
 
$
39,882

 
 
Amount allocated to common stockholders
100.00
%
 
 
 
91.84
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
(25,678
)
87,050

$
(0.29
)
 
36,628

87,838

$
0.42

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-based compensation plans
—

—

 
 
—

657

 
Diluted EPS:
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
$
(25,678
)
87,050

$
(0.29
)
 
$
36,628

88,495

$
0.41
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,
 
2016
2015
2016
2015
 
 
 
 
 
Stock options (1)
372,902

543,171

277,617

332,766

Service-based share awards (1)
1,427,194

691,773

1,010,856

—

(1)
In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on earnings (loss) per share. In periods when we report net income, certain share-based compensation awards may be excluded from the calculation of diluted EPS if the exercise price was greater than the average market price of the underlying common stock.