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Share-based compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 28, 2016
employee
shares
Mar. 30, 2011
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accumulated compensation expense | $     $ 0 $ 0 $ 0
2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of total outstanding shares of the entity immediately follow the IPO that is authorized under equity incentive plan   2.50%      
Options converted into liability award (in shares) 1,117,380        
Number of employees affected by plan modification | employee 104        
Share-based compensation expense | $     1,884 3,661 3,267
Related income tax (expense) benefit | $     (422) (175) 151
Restricted Share Units | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total fair value of share units | $     $ 3,295 $ 3,214 $ 2,763
Grant (in shares)     35,000 520,393 497,960
Grant price (in dollars per share) | $ / shares     $ 8.00 $ 8.50 $ 9.20
Phantom RSU Award | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant (in shares)     1,672,657    
Grant price (in dollars per share) | $ / shares     $ 6.78    
Allocated share-based compensation expense | $     $ 2,102    
Phantom RSU Award Type One | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Requisite service period     5 years    
Grant (in shares)     465,202    
Phantom RSU Award Type Two | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant (in shares)     1,207,455    
Second Anniversary of Grant Date | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     40.00%    
Second Anniversary of Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     40.00%    
Three Years Following The Grant Date | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     20.00%    
Three Years Following The Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     20.00%    
Third Anniversary of Grant Date | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     20.00%    
Fourth Anniversary of Grant Date | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     20.00%    
Fifth Anniversary of Grant Date | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     20.00%    
Fifth Anniversary of Grant Date | Phantom RSU Award Type Two | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     100.00%    
Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued during the period     470,558 520,565 361,284
Number of shares issued during the period related to partial vesting       10,870  
Class A | Partial Vesting 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares pending issuance in connection with partial vesting     3,154    
Value of shares pending for issuance in connection with partial vesting | $     $ 18    
Class A | Partial Vesting 2018          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares pending issuance in connection with partial vesting     2,901    
Value of shares pending for issuance in connection with partial vesting | $     $ 20    
Common Stock | Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued during the period     470,558 520,565 361,284
Accumulated compensation expense | $     $ 3,359 $ 3,113 $ 2,763