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Stockholders' equity (Share-based compensation) (Details)
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options granted (in shares) 818,620
Granted stock options, exercise price (in dollars per share) | $ / shares $ 9.39
Restricted Stock and Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of equity instruments other than options granted (in shares) 1,670,270
Restricted Stock and Restricted Stock Units | Board of Directors  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of equity instruments other than options granted (in shares) 119,817
Award vesting period 12 months
Restricted Stock and Restricted Stock Units with Specified Vesting Period  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of equity instruments other than options granted (in shares) 1,292,553
Award vesting period 4 years
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of equity instruments other than options granted (in shares) 257,900
Performance Shares | Share-based Compensation Award, Tranche One  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance measurement period 1 year
Performance Shares | Share-based Compensation Award, Tranche Two  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance measurement period 2 years
Performance Shares | Share-based Compensation Award, Tranche Three  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance measurement period 3 years
Performance Shares | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share conversion ratio 0
Performance Shares | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share conversion ratio 2