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Earnings (loss) per share (Tables)
 3 Months Ended
Mar. 31, 2017
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 months ended March 31, 2017 and 2016:
 
For the three months ended March 31,
 
2017
 
2016
 
Loss
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net loss
$
(15,139
)
 
 
 
$
(16,163
)
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
100.00
%
 
 
Basic and diluted EPS:
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(15,139
)
87,254

$
(0.17
)
 
$
(16,163
)
87,040

$
(0.19
)
Securities excluded from the calculation of diluted EPS
Securities excluded from the calculation of diluted EPS:
Three months ended March 31,
 
2017
2016
 
 
 
Stock options
207,716

393,237

Service-based share awards
1,037,320

498,809