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Summary of significant accounting policies (Effect of Topic 842) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2017
Non-current assets            
Lease right of use asset, net $ 790,969 $ 922,165   $ 896,682    
Current liabilities            
Operating lease liabilities 56,828 70,147   72,272    
Non-current liabilities            
Accrued payroll and other liabilities 21,884 23,497 $ 35,322 18,918 $ 34,378  
Operating lease liabilities 752,613 861,582   840,814    
Equity            
Retained earnings 290,895 471,149 413,074   $ 397,338  
Accumulated other comprehensive loss (584,860) (519,505)        
Foreign currency exchange results $ (31,707) 12,754 14,874      
Previously Reported            
Non-current liabilities            
Accrued payroll and other liabilities     35,322     $ 29,366
Equity            
Retained earnings           $ 401,134
ASC 842            
Non-current assets            
Lease right of use asset, net   922,165   913,000    
Current liabilities            
Operating lease liabilities   70,147        
Non-current liabilities            
Accrued payroll and other liabilities   (17,587)        
Operating lease liabilities   861,582        
Equity            
Retained earnings   3,589        
Accumulated other comprehensive loss   4,434        
Capitalization of operating lease right of use assets       913,086    
Straight-line rent accrual       $ 16,404    
Foreign currency exchange results   3,589        
ASC 842 | Restatement Adjustment            
Non-current assets            
Lease right of use asset, net     896,682      
Current liabilities            
Operating lease liabilities     72,272      
Non-current liabilities            
Accrued payroll and other liabilities     (16,404)      
Operating lease liabilities     $ 840,814      
Pro Forma            
Non-current assets            
Lease right of use asset, net   0        
Current liabilities            
Operating lease liabilities   0        
Non-current liabilities            
Accrued payroll and other liabilities   41,084        
Operating lease liabilities   0        
Equity            
Retained earnings   467,560        
Accumulated other comprehensive loss   (523,939)        
Foreign currency exchange results   $ 9,165