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Earnings (loss) per share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2016 and 2015:
 
For the three months ended September 30,
 
2016
 
2015
 
Loss
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net loss
$
(58,273
)
 
 
 
$
(56,112
)
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
100.00
%
 
 
Basic and diluted EPS:
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(58,273
)
87,076

$
(0.67
)
 
$
(56,112
)
86,907

$
(0.65
)


 
For the nine months ended September 30,
 
2016
 
2015
 
Loss
Shares (000)
Per-Share
 
Income
Shares (000)
Per-Share
Net loss
$
(83,951
)
 
 
 
$
(16,230
)
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
100.00
%
 
 
Basic and diluted EPS:
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(83,951
)
87,059

$
(0.96
)
 
$
(16,230
)
87,524

$
(0.19
)
Securities excluded from the calculation of diluted EPS
Securities excluded from the calculation of diluted EPS:
Three months ended September 30,
Nine months ended September 30,
 
2016
2015
2016
2015
 
 
 
 
 
Stock options
372,569

317,266

391,375

327,599

Service-based share awards
1,449,520

646,128

1,157,077

599,001