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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Schedule of reconciliation of basic and diluted weighted average shares outstanding
The following sets forth the computation of basic and diluted earnings (loss) per share for the three and nine months ended September 30, 2014 and 2013:
 

 
For the three months ended
 
For the nine months ended
 

 
September 30, 2014
 
September 30, 2013
 
September 30, 2014
 
September 30, 2013
Weighted-average number of common shares outstanding:
 

 

 

 

 
Basic number of common shares outstanding
 
103,295,920

 
89,620,394

 
103,275,204

 
82,630,430

 
Dilutive effect of options
 
—

 
294,434

 
1,494,711

 
—

 
Dilutive effect of warrants
 
—

 
1,000,977

 
1,684,860

 
823,405

 
Diluted number of common shares outstanding
 
103,295,920

 
90,915,805

 
106,454,775

 
83,453,835

 

 

 

 

 

Basic net income (loss) per common share:
 

 

 

 

 
Net income (loss)
 
$
(5,997
)
 
$
46,570

 
$
65,074

 
$
147,223

 
Net income allocated to participating shares
 
—

 
(322
)
 
(420
)
 
(1,099
)
 
Net income (loss) available to common shareholders
 
$
(5,997
)
 
$
46,248

 
$
64,654

 
$
146,124

 
Basic net income (loss) per common share
 
$
(0.06
)
 
$
0.52

 
$
0.63

 
$
1.77

 Diluted net income (loss) per common share:
 

 

 

 

 
Net income (Loss)
 
$
(5,997
)
 
$
46,570

 
$
65,074

 
$
147,223

 
Net income allocated to participating securities
 
—

 
(318
)
 
(408
)
 
(1,089
)
 
Net income (loss) available to common shareholders
 
$
(5,997
)
 
$
46,252

 
$
64,666

 
$
146,134

 
Diluted net income (loss) per common share
 
$
(0.06
)
 
$
0.51

 
$
0.61

 
$
1.75