Inventories (Table)

12 Months Ended

Dec. 31, 2017

Disclosure Of Inventories Explanatory [Abstract]

Disclosure of detailed information about inventories [Text Block]

The composition of inventory at each period-end is as follows:

Type of inventory	12/31/2017 ThUS$		12/31/2016 ThUS$		12/31/2015 ThUS$
Raw material reserves		9,364		7,536		4,844
Supplies for production reserves		22,257		23,610		29,353
Products-in-progress reserves		456,333		482,261		478,627
Finished product reserves		414,120		479,665		491,022
Total		902,074		993,072		1,003,846

Disclosure of information about inventory reserves [Text Block]

The breakdown of inventory reserves is detailed as follows:

Type of inventory	12/31/2017 ThUS$		12/31/2016 ThUS$		12/31/2015 ThUS$
Raw material reserves		93		93		93
Suministros para la producción		-		920		920
Products-in-progress reserves		80,249		50,925		53,187
Finished product reserves		15,942		29,357		26,169
Total		96,284		81,295		80,369

Disclosure of movements in provisions for inventories [Text Block]

As of December 31, 2017, 2016 and 2015, movements in provisions are detailed as follows:

Reconciliation	12/31/2017		12/31/2016		12/31/2015
	ThUS$		ThUS$		ThUS$
Opening balance		81,295		80,369		82,966
Changes
Additional provisions		21,953		9,831		18,461
Increase (decrease) in existing provisions		(6,964)		(8,905)		(21,058)
Total changes		14,989		926		(2,597)
Final Balance		96,284		81,295		80,369