XML 94 R66.htm IDEA: XBRL DOCUMENT v3.20.1
Description of the business and summary of significant accounting policies - Foreign currency exchange differences and liabilities and provisions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
$ / $
Q / $
Dec. 31, 2019
$ / $
₡ / $
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2019
MXN ($)
$ / $
Dec. 31, 2018
$ / $
Q / $
Dec. 31, 2018
$ / $
₡ / $
Dec. 31, 2018
MXN ($)
$ / $
Dec. 31, 2017
$ / $
Q / $
Dec. 31, 2017
$ / $
₡ / $
Dec. 31, 2017
MXN ($)
$ / $
Apr. 27, 2020
$ / $
Dec. 31, 2019
Q / $
Dec. 31, 2019
₡ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
Dec. 31, 2017
Q / $
Dec. 31, 2017
₡ / $
Description of the business and summary of significant accounting policies                                    
Average exchange rate for year 7.7066 590.9574 19.2618   7.5337 580.8534   7.3509 572.2000                  
Exchange rate as of end of the year 18.8452 18.8452 18.8452 18.8452 19.6829 19.6829 19.6829 19.7354 19.7354 19.7354 24.6230 7.6988 573.4400 18.8452 7.7440 609.6100 7.3448 572.5600
Exchange differences on translation of foreign operations     $ 427,000 $ 8,045     $ 22,156     $ (7,178)