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Earnings (loss) per share (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2017 and 2016:
 
For the three months ended September 30,
 
2017
 
2016
 
Income
 
Shares
 
Per Share
 
Loss
 
Shares
 
Per Share
Net income (loss)
$
20,783

 
 
 
 
 
$
(58,273
)
 
 
 
 
Amount allocated to common stockholders
92.06
%
 
 
 
 
 
100.00
%
 
 
 
 
Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
$
19,132

 
87,318

 
$
0.22

 
$
(58,273
)
 
87,076

 
$
(0.67
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
 
 
 
 
Share-based compensation
—

 
937

 
 
 
—

 
—

 
 
Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders with assumed conversion
$
19,132

 
88,255

 
$
0.22

 
$
(58,273
)
 
87,076

 
$
(0.67
)
 
 
 
 
 
 
 
 
 
 
 
 
 
For the nine months ended September 30,
 
2017
 
2016
 
Income
 
Shares
 
Per Share
 
Loss
 
Shares
 
Per Share
Net income (loss)
$
12,775

 
 
 
 
 
$
(83,951
)
 
 
 
 
Amount allocated to common stockholders
92.04
%
 
 
 
 
 
100
%
 
 
 
 
Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
11,758

 
87,282

 
$
0.13

 
(83,951
)
 
87,059

 
$
(0.96
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
 
 
 
 
Share-based compensation
—

 
788

 
 
 
—

 
—

 
 
Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
11,758

 
88,070

 
$
0.13

 
$
(83,951
)
 
87,059

 
$
(0.96
)
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,
 
2017
 
2016
 
2017
 
2016
Share-based compensation
535

 
1,822

 
524

 
1,548