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Inventories (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories [Abstract]        
Raw material reserves $ 1,838 $ 93 $ 93  
Suministros para la producción 0 0 920  
Products-in-progress reserves 82,673 80,249 50,925  
Finished product reserves 20,771 15,942 29,357  
Total $ 105,282 $ 96,284 $ 81,295 $ 80,369