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Earnings (loss) per share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016:
 
For the three months ended June 30,
 
2017
 
2016
 
Income
 
Shares (000)
 
Per Share
 
Loss
 
Shares (000)
 
Per Share
Net income (loss)
$
7,131

 
 
 
 
 
$
(9,515
)
 
 
 
 
Amount allocated to common stockholders
92.03
%
 
 
 
 
 
100.00
%
 
 
 
 
Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
$
6,563

 
87,272

 
$
0.08

 
$
(9,515
)
 
87,060

 
$
(0.11
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
 
 
 
 
Share-based compensation
—

 
785

 
 
 
—

 
—

 
 
Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders with assumed conversion
$
6,563

 
88,057

 
$
0.07

 
$
(9,515
)
 
87,060

 
$
(0.11
)
 
 
 
 
 
 
 
 
 
 
 
 
 
For the six months ended June 30,
 
2017
 
2016
 
Loss
 
Shares (000)
 
Per Share
 
Loss
 
Shares (000)
 
Per Share
Net loss
$
(8,008
)
 
 
 
 
 
$
(25,678
)
 
 
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
 
 
100
%
 
 
 
 
Basic and diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(8,008
)
 
87,263

 
$
(0.09
)
 
$
(25,678
)
 
87,050

 
$
(0.29
)
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,
 
2017
 
2016
 
2017
 
2016
Share-based compensation
432,506

 
1,800,096

 
462,506

 
1,288,473