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Stockholders' equity and dividend payment, Series C Participating Preferred stock (Details) - $ / shares
Dec. 31, 2019
Jan. 31, 2017
Common Stock [Member]    
Series C Participating Preferred Stock [Abstract]    
Par value (in dollars per share) $ 0.01 $ 0.01
Series C Participating Preferred Stock [Member]    
Series C Participating Preferred Stock [Abstract]    
Number of preferred share purchase right, for each outstanding common stock (in shares)   1
Par value (in dollars per share)   $ 0.01
Share price (in dollars per share)   $ 22.00
Number of shares purchased (in shares)   0.0001