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Share-based compensation (Summary of Vested and Nonvested Awards) (Details) - 2011 Equity Incentive Plan
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Stock Option  
Vested  
Number of units outstanding, Vested (in shares) | shares 455,719
Weighted-average fair value per unit, Vested (in dollars per share) | $ / shares $ 3.95
Total grant-date fair value of the plan, Vested $ 1,800
Weighted-average accumulated percentage of service, Vested (as a percent) 100.00%
Stock-based compensation recognized in Additional paid-in capital, vested $ 1,800
Compensation expense not yet recognized, Vested $ 0
Non-Vested  
Number of units outstanding, Non-vested (in shares) | shares 35,354
Weighted-average fair market value per unit, Non-vested (in dollars per share) | $ / shares $ 1.98
Total grant-date fair value of the plan, Non-vested $ 70
Weighted-average accumulated percentage of service, Non-vested (as a percent) 92.90%
Stock-based compensation recognized in Additional paid-in capital, Non-vested $ 65
Compensation expense not yet recognized, Non-vested $ 5
Total  
Number of units outstanding, Total (in shares) | shares 491,073
Weighted-average fair market value per unit, Total (in dollars per share) | $ / shares $ 3.81
Total grant-date fair value of the plan, Total $ 1,870
Weighted-average accumulated percentage of service, Total (as a percent) 99.70%
Stock-based compensation recognized in Additional paid-in capital, Total $ 1,865
Compensation expense not yet recognized, Total $ 5
Restricted Share Units  
Total  
Number of units outstanding, Total (in shares) | shares 1,605,049
Weighted-average fair market value per unit, Total (in dollars per share) | $ / shares $ 7.41
Total grant-date fair value of the plan, Total $ 11,900
Weighted-average accumulated percentage of service, Total (as a percent) 51.70%
Stock-based compensation recognized in Additional paid-in capital, Total $ 6,157
Compensation expense not yet recognized, Total $ 5,743