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Share-based compensation plans - Schedule of status of awards other than options, and changes during the period (Details) - 2009 share award and incentive plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred shares | Class A common shares    
Shares    
Outstanding (in shares) 1,162,187 1,851,309
Granted (in shares) 624,261 653,787
Vested and issued (in shares) (331,299) (535,407)
Forfeited, cancelled or expired (in shares) (261,374) (807,502)
Outstanding (in shares) 1,193,775 1,162,187
Weighted average exercise price    
Outstanding, weighted average exercise price (in dollars per share) $ 0.01 $ 0.01
Granted, weighted average exercise price (in dollars per share) 0.01 0.01
Vested and issued, weighted average exercise price (in dollars per share) 0.01 0.01
Forfeited, cancelled or expired, weighted average exercise price (in dollars per share) 0.01 0.01
Outstanding, weighted average exercise price (in dollars per share) $ 0.01 $ 0.01
Aggregate intrinsic value    
Outstanding, aggregate intrinsic value $ 15,925  
Vesting August 1, 2017 | Restricted Stock without Performance Criteria Share-based Payments    
Shares    
Granted (in shares) 3,287  
Vesting March 18, 2019 | Restricted Stock without Performance Criteria Share-based Payments    
Shares    
Granted (in shares) 43,625  
Vesting March 18, 2017 | Restricted Stock without Performance Criteria Share-based Payments    
Shares    
Granted (in shares) 43,625  
On Retirement | Restricted Stock without Performance Criteria Share-based Payments    
Shares    
Granted (in shares) 61,164  
Vesting June 24, 2017 | Share options | Class A common shares    
Shares    
Granted (in shares) 47,650  
Vesting June 24, 2017 | Restricted Stock without Performance Criteria Share-based Payments    
Shares    
Granted (in shares) 81,551  
Vesting March 18, 2019 II | Restricted Stock without Performance Criteria Share-based Payments    
Shares    
Granted (in shares) 293,900