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Share-based compensation - Schedule of management and director options activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share compensation expenses $ 2,246 $ 1,716 $ 4,498 $ 3,468  
Number of options (in shares)          
Outstanding (in shares)     10,981,075 10,956,838 10,956,838
Forfeited (in shares)     0   (324,599)
Exercised (in shares)     0   0
Outstanding (in shares) 11,329,911   11,329,911   10,981,075
Weighted average exercise price (in dollars per share)          
Outstanding (in dollars per share)     $ 13.23 $ 13.20 $ 13.20
Forfeited (in dollars per share)     $ 0.00   $ 13.20
Exercised (in dollars per share)     $ 0.00   $ 0.00
Outstanding (in dollars per share) $ 13.38   $ 13.38   $ 13.23
Management
          
Number of options (in shares)          
Granted (in shares)     348,836   348,836
Weighted average exercise price (in dollars per share)          
Granted (in dollars per share)     $ 18.25   $ 14.09
Director
          
Number of options (in shares)          
Granted (in shares)     0   0
Weighted average exercise price (in dollars per share)          
Granted (in dollars per share)     $ 0.00   $ 0.00
Management and director options
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share compensation expenses $ 1,700 $ 1,500 $ 3,400 $ 2,800  
Number of options (in shares)          
Outstanding (in shares) 11,329,911   11,329,911    
Weighted average exercise price (in dollars per share)          
Outstanding (in dollars per share) $ 13.38   $ 13.38