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Stockholders equity and dividend payment (Tables)
 9 Months Ended
Sep. 30, 2019
Stockholders equity and dividend payment (Tables) [Abstract]  
Stockholders equity
Stockholders equity

 
Common stock
Preferred stock
Issued at September 30, 2019
142,418,941
-
Shares to be issued assuming conversion of
   convertible notes due 2019*
6,789,844  
Shares to be issued assuming conversion of
   convertible notes due 2021*
30,824,087  
Numbers of shares authorized for issue
   at September 30, 2019
250,000,000  1,000,000
Par value
$ 0.01
$ 0.01
Dividend payment
Dividend payment as of September 30, 2019:

Payment date
Total Payment
Per common share
August 29, 2019
$
2.8 million
$
0.02
May 28, 2019
$
11.4 million
$
0.08
February 26, 2019
$
7.1 million
$
0.05
Total payment as per September 30, 2019
$
21.3 million
$
0.15
         
Dividend payment as of December 31, 2018:
        
         
Payment date
Total Payment
Per common share
November 23, 2018
$
2.9 million
$
0.02
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 December 31, 2018
$
11.5 million
$
0.08