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Share-based compensation - 2014 Plan RSUs (Details) - Restricted share units ("RSUs") - 2014 Plan - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 14, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of shares        
Undistributed at beginning of year (in shares)   179,068    
Granted (in shares)   358,678   179,068
Distributed (in shares)   (179,068)    
Forfeited (in shares)   (51,615)    
Undistributed at end of year (in shares)   307,063 179,068  
Weighted average grant-date fair value        
Undistributed at beginning of year (in dollars per share)   $ 9.99    
Granted (in dollars per share)   9.05   $ 9.99
Distributed (in dollars per share)   9.99    
Forfeited (in dollars per share)   8.67    
Undistributed at end of year (in dollars per share)   $ 9.11 $ 9.99  
Other disclosure        
Total fair value of shares that vested (in dollars)   $ 2.3 $ 0.0 $ 0.0
Chief Executive Officer        
Number of shares        
Granted (in shares) 179,068      
Minimum        
Other disclosure        
Vesting period   1 year    
Maximum        
Other disclosure        
Vesting period   3 years