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Events after the reporting date (Details)
$ / shares in Units, $ in Millions
 1 Months Ended
Feb. 05, 2020
USD ($)
$ / shares
Jan. 31, 2020
shares
$ / shares
Share Transactions [Member] | Restricted Shares [Member]    
Restricted Shares [Abstract]    
Number of shares, awarded (in shares)   660,000
Number of shares, vested in year one (in shares)   253,334
Number of shares, vested in year two (in shares)   53,333
Number of shares, vested in year three (in shares)   153,333
Number of shares, vesting subject to certain market conditions (in shares)   200,000
Number of shares, vesting in year one to three (in shares)   460,000
Number of shares granted, share price (in dollars per share) | $ / shares   $ 3.5637
Share Transactions [Member] | Restricted Shares [Member] | Board of Directors [Member]    
Restricted Shares [Abstract]    
Number of shares, awarded (in shares) | $ / shares   150,000
Dividend Declared for Q1 [Member]    
Dividend [Abstract]    
Dividend declare date Feb. 05, 2020  
Dividend declared (in dollars per share) | $ / shares $ 0.32  
Dividends payable date Feb. 25, 2020  
Dividend record date Feb. 18, 2020  
Total dividend payment | $ $ 47.0