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Cash and cash equivalents (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 556,066 $ 630,438 $ 514,669 $ 527,259
Chilean Peso [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 157,500 579    
US Dollar [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 353,037 612,727    
Euro [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 4,739 9,782    
Australian dollar [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 29,598 0    
Mexican Peso [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 1,242 258    
South African Rand [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 5,843 4,074    
Japanese Yen [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 1,786 1,773    
Peruvian Sol [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 7 8    
Brazilian Real [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 0 38    
Chinese Yuan [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 2,305 1,143    
Indian Rupee [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 3 0    
UAE dirham [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 1 0    
Argentine Peso [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 2 1    
Pound Sterling [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 3 $ 55