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Summary of significant accounting policies (Effect of Topic 842) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Non-current assets          
Lease right of use asset, net $ 922,165     $ 896,682  
Current liabilities          
Operating lease liabilities 70,147     72,272  
Non-current liabilities          
Accrued payroll and other liabilities 23,497 $ 35,322   18,918 $ 34,378
Operating lease liabilities 861,582     840,814  
Equity          
Retained earnings 471,149 413,074     $ 397,338
Accumulated other comprehensive loss (519,505) (502,266)      
Foreign currency exchange results 12,754 14,874 $ (14,265)    
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