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Financial instruments (Details Textual)
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 08, 2018
USD ($)
Apr. 05, 2018
USD ($)
Apr. 03, 2013
USD ($)
Apr. 04, 2012
USD ($)
Jan. 13, 2009
USD ($)
Oct. 31, 2018
USD ($)
Oct. 23, 2014
USD ($)
Apr. 21, 2010
USD ($)
Sep. 30, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 04, 2012
CLF ( )
Jan. 13, 2009
CLF ( )
Jan. 24, 2006
USD ($)
Jan. 24, 2006
CLF ( )
Financial instruments [Line Items]                              
Term deposits, maturity                 greater than 90 days and less than 360 days            
Current bonds issued net of issuance costs                   $ 15,145,000 $ 13,494,000        
Non current bonds issued net of issuance costs                   68,870,000 1,031,507,000        
Notional amount                   16,796,000 1,039,755,000        
Borrowings, maturity           2038                  
Outstanding purchase commitments                   59,919,000 41,601,000        
Single series bond One [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   2,288,000          
Non current bonds issued net of issuance costs                     249,483,000        
Notional amount                   $ 2,674,000 $ 250,000,000        
Borrowings, interest rate                   0.95% 5.50%        
Borrowings, maturity                   4/21/2019 04/21/2020        
Single series bond One [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount               $ 250,000              
Borrowings, interest rate               5.50%              
Borrowings, maturity               10              
Single series bond Three [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   $ 2,044,000          
Non current bonds issued net of issuance costs                     $ 297,382,000        
Notional amount                   $ 2,658,000 $ 300,000,000        
Borrowings, interest rate                   177.00% 3.63%        
Borrowings, maturity                   4/03/2019 04/03/2023        
Single series bond Three [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount     $ 300                        
Borrowings, interest rate     3.625%                        
Borrowings, maturity     10                        
Annual yield rate     3.716%                        
Description of difference between the annual interest rate and comparable rate with treasury bonds     This rate equates to a difference of 180 basis points to comparable US Treasury bonds                        
Single series bond Two [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   $ 4,215,000          
Non current bonds issued net of issuance costs                     $ 247,364,000        
Notional amount                   $ 4,648,000 $ 250,000,000        
Borrowings, interest rate                   275.00% 4.38%        
Borrowings, maturity                   1/28/2019 01/28/2025        
Single series bond Two [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount             $ 250,000,000                
Borrowings, interest rate             4.375%                
Borrowings, maturity             2025                
Percentage of bonds issue price             99.41%                
Series C bonds [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount                           $ 101,918,000 3,000,000
Borrowings, interest rate                           4.00% 4.00%
Series H bonds [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   $ 3,617,000          
Non current bonds issued net of issuance costs                     $ 172,835,000        
Notional amount                   $ 3,756,000 $ 174,367,000        
Borrowings, interest rate                   190.00% 4.90%        
Borrowings, maturity                   1/05/2019 01/05/2030        
Series H bonds [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount         $ 139,216,000               4,000,000    
Borrowings, interest rate         4.90%               4.90%    
Borrowings, maturity         21                    
Series Q bonds [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   $ 342,000          
Notional amount                   $ 342,000          
Borrowings, interest rate           3.45%       334.00%          
Borrowings, maturity                   6/01/2019          
Percentage Of Funds From Sale Of Financial Assets Used For Expansion 90.00%                            
Proceeds from disposal or maturity of available-for-sale financial assets $ 83,567,623,842                            
Bond Authorised to Issue           $ 3,000,000                  
Series O bonds [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   $ 867,000          
Non current bonds issued net of issuance costs                     $ 64,443,000        
Notional amount                   $ 934,000 $ 65,388,000        
Borrowings, interest rate                   260.00% 3.80%        
Borrowings, maturity                   2/01/2019 01/02/2033        
Series O bonds [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount       $ 69,901,000               1,500,000      
Borrowings, interest rate       3.80%               3.80%      
Borrowings, maturity       21                      
Series P bonds [Member]                              
Financial instruments [Line Items]                              
Current bonds issued net of issuance costs                   $ 1,772,000          
Notional amount                   $ 1,784,000          
Borrowings, interest rate   3.25%               307.00%          
Borrowings, maturity   2028               1/15/2019          
Bond Authorised to Issue   $ 3,000,000                          
Series M Bonds [Member] | Bonds issued [Member]                              
Financial instruments [Line Items]                              
Notional amount       $ 46,601,000               1,000,000      
Borrowings, interest rate       3.30%               3.30%      
Borrowings, maturity       5