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Share-based compensation - 2014 Plan PSUs (Details) - 2014 Plan
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Performance share units ("PSUs")  
Number of shares  
Non-vested at beginning of year (in shares) 111,564
Granted (in shares) 13,000
Retired (in shares) (12,000)
Vested (in shares) (58,500)
Non-vested at end of year (in shares) 54,064
Weighted average grant-date fair value  
Non-vested at beginning of year (in dollars per share) | $ / shares $ 5.76
Granted (in dollars per share) | $ / shares 4.99
Retired (in dollars per share) | $ / shares 5.76
Vested (in dollars per share) | $ / shares 5.76
Non-vested at end of year (in dollars per share) | $ / shares $ 5.57
Other disclosure  
Total fair value of shares that vested (in dollars) | $ $ 2.0
PSUs awarded but not yet earned  
Number of shares  
Non-vested at end of year (in shares) 437,060
Total non-vested and discretionary PSUs  
Number of shares  
Non-vested at end of year (in shares) 491,124