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Stockholders equity and dividend payment (Tables)
 9 Months Ended
Sep. 30, 2018
Stockholders equity and dividend payment (Tables) [Abstract]  
Stockholders equity
Stockholders equity
 
 
Common stock
  
Preferred stock
Issued at September 30, 2018
143,592,543
  
0
Shares to be issued assuming conversion of
      
   convertible notes due 2019*
6,562,001
    
Shares to be issued assuming conversion of
      
   convertible notes due 2021*
19,968,375
    
Numbers of shares authorized for issue
      
   at September 30, 2018
250,000,000
  
1,000,000
Par value
$ 0.01
 
$ 0.01
                *assuming the maximum Fundamental Change conversion rate.   
Dividend payment
Dividend payment as of September 30, 2018:
 
Payment date
Total Payment
Per common share
August 31, 2018
$
2.9 million
$
0.02
May 30, 2018
$
2.9 million
$
0.02
February 28, 2018
$
2.9 million
$
0.02
Total payment as per September 30, 2018
$
8.6 million
$
0.06
         
Dividend payment as of December 31, 2017:
        
         
Payment date
Total Payment
Per common share
December 6, 2017
$
2.8 million
$
0.02
August 31, 2017
$
2.8 million
$
0.02
May 31, 2017
$
10.1 million
$
0.08
February 22, 2017
$
7.6 million
$
0.08
Total payment as per December 31, 2017
$
23.3 million
$
0.20